Patents by Inventor David Dolphin
David Dolphin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6620929Abstract: Methods of modifying polypyrrolic macrocycles by use of a 1,3-dipolar cycloaddition are described. The methods may be used to produce compounds for further derivatization to produce photosensitizing agents of interest.Type: GrantFiled: April 14, 2000Date of Patent: September 16, 2003Assignee: University of British ColumbiaInventors: Jill Kirsten MacAlpine, Ethan D. Sternberg, David Dolphin
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Publication number: 20020155089Abstract: The invention is generally related to the field of photodynamic therapy by use of photosensitizers and stabilized formulations of the photosensitizers. These formulations may be used to deliver a photosensitizer as a pharmaceutical, agricultural, or industrial agent. The photosensitizer containing formulations and compositions of the invention comprise one or more block copolymers. Furthermore, the invention relates to processes for the production of, and application of, said formulations and compositions as photosensitizer drug delivery systems.Type: ApplicationFiled: May 8, 2001Publication date: October 24, 2002Inventors: Rubinah K. Chowdhary, David Dolphin
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Publication number: 20020079221Abstract: A method for the separation of benzoporphyrin derivative mono and diacid (BPD-MA, BPD-DA) enantiomers by Laser-Induced Fluorescence Capillary Electrophoresis has been developed. The limits of detection are 2.06×10−6 M, and the relative standard deviation for the separation was 2.90% to 4.64%. The BPD enantiomers can be quantitatively determined in the range of 10−2 to 10−5 mg mL−1. In comparison with HPLC, CE has better resolution and efficiency. This separation method was successfully applied to the BPD enantiomers obtained from a matrix of bovine serum and from liposomally formulated material as well as from studies with rat, dog and human microsomes.Type: ApplicationFiled: December 17, 2001Publication date: June 27, 2002Inventors: David Dolphin, Xuejun Peng, Ethan D. Sternberg
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Publication number: 20020061330Abstract: The invention is generally related to the field of formulating medicaments in association with a solid support. Such formulations comprising photosensitizers, and their use in photodynamic therapy, are also provided. Methods for the production of the medicament formulations are also disclosed.Type: ApplicationFiled: May 8, 2001Publication date: May 23, 2002Inventors: Rubinah K. Chowdhary, David Dolphin
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Patent number: 6331235Abstract: A method for the separation of benzoporphyrin derivative mono and diacid (BPD-MA, BPD-DA) enantiomers by Laser-Induced Fluorescence Capillary Electrophoresis has been developed. The limits of detection are 2.06×10−6 M, and the relative standard deviation for the separation was 2.90% to 4.64%. The BPD enantiomers can be quantitatively determined in the range of 10−2 to 10−5 mg mL−1. In comparison with HPLC, CE has better resolution and efficiency. This separation method was successfully applied to the BPD enantiomers obtained from a matrix of bovine serum and from liposomally formulated material as well as from studies with rat, dog and human microsomes.Type: GrantFiled: May 28, 1999Date of Patent: December 18, 2001Assignee: The University of British ColumbiaInventors: David Dolphin, Xuejun Peng, Ethan D. Sternberg
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Patent number: 6153639Abstract: New compounds useful in photodynamic therapy are of the formula ##STR1## and their 1,4-diene isomers and the metallated and/or labeled and/or conjugated forms thereofwherein each R.sup.1 is independently alkyl (1-6C);each n is independently an integer of 0-6; andR.sup.2 is vinyl or a derivative form thereof.Type: GrantFiled: May 17, 1999Date of Patent: November 28, 2000Assignees: QLT PhotoTherapeutices Inc., The University of British ColumbiaInventors: Ethan Sternberg, David Dolphin, Julia G. Levy, Anna M. Richter, David W. C. Hunt, Ashok Jain, Elizabeth M. Waterfield, Ronald E. Boch
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Patent number: 6093739Abstract: The present invention provides for novel therapeutic macrocycle compounds useful in photodynamic therapy that are based on the chlorin ring system. The macrocycle compounds have, in many cases, wavelengths of activation at about 670 nm, characteristics of chlorins, and are stabilized against oxidation by the attachment to the chlorin ring of a structure that comprises one or more exocyclic rings that contribute at least one nitrogen atom. Protonation or covalent modification of this nitrogen atom, or other covalent modification of the one or more exocyclic rings permits optimization of pharmacalogically relevant properties including, for example, solubility.Type: GrantFiled: November 20, 1998Date of Patent: July 25, 2000Assignee: The University of British ColumbiaInventors: Claire K. Johnson, David Dolphin
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Patent number: 6022981Abstract: The invention provides for tripyrrane compounds of the formula ##STR1## wherein: each Q represents, typically, an alkyl group, cycloalkyl group, aryl group, or a heteroaryl group; and each R represents hydrogen, an alkyl group, alcohol group, or a carbonyl-containing group.Additionally, there are described methods to prepare such compounds, for example, comprising the steps of:(a) reacting a compound of the formula:Q--CHO or Q--CH(OS)(OS')wherein S and S' are independently lower alkyl, an aryl group containing from 5 to 14 ring atoms, and --(CH.sub.2).sub.n -- where n =2-4;with a stoichiometric excess of a pyrrole having the formula: ##STR2## in the presence of a catalytic amount of an acid; (b) removing the unreacted pyrrole or any other solvents used in (a) by evaporation to form a residue; and(c) treating the residue to remove high molecular weight polymeric materials and the corresponding dipyrromethane by-product, leaving the desired compound.Type: GrantFiled: May 17, 1999Date of Patent: February 8, 2000Assignee: The University of British ColumbiaInventors: Christian Bruckner, Ross W. Boyle, David Dolphin
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Patent number: 5990149Abstract: New compounds expanding the repertoire of compounds useful in photodynamic therapy are described. Monohydrobenzoporphyrins can be obtained in the triacid form or as esters with heteroatom-substituted alcohols, or as amides.Type: GrantFiled: March 9, 1999Date of Patent: November 23, 1999Assignee: University of British of ColumbiaInventors: Ethan D. Sternberg, David Dolphin, Andrew Tovey, Anna M. Richter, Julia G. Levy
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Patent number: 5945439Abstract: This invention is a process for the use of a combination of ionizing radiation in conjunction with certain benzoporphyrin derivative compounds (BPD), preferably the compound benzoporphyrin derivative-monoacid ring-A (BPD-MA), to mediate the destruction of diseased or unwanted cells or tissues. Specifically, the invention is a method in which the sensitizer compounds are administered either systemically or locally to the diseased or unwanted tissue and irradiated with ionizing radiation (such as might be produced by a .sup.60 Co or x-ray source). The treatment with benzoporphyrin derivative compounds appears to sensitize the target cells or tissues in that those cells do not readily recover from irradiation exposure. In addition, the process may be used to lower the effective amount of radiation applied to a particular tissue target.Type: GrantFiled: July 2, 1997Date of Patent: August 31, 1999Assignee: QLT PhotoTherapeutics, Inc.Inventors: Anna Richter, Julia G. Levy, David Dolphin
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Patent number: 5929105Abstract: New compounds useful in photodynamic therapy are of the formula ##STR1## and their 1,4-diene isomers and the metallated and/or labeled and/or conjugated forms thereofwherein each R.sup.1 is independently alkyl (1-6C);each n is independently an integer of 0-6; andR.sup.2 is vinyl or a derivative form thereof.Type: GrantFiled: June 1, 1998Date of Patent: July 27, 1999Assignees: QLTPhoto Therapeutics, Inc., The University of British ColumbiaInventors: Ethan Sternberg, David Dolphin, Julia G. Levy, Anna M. Richter, David W. C. Hunt, Ashok Jain
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Patent number: 5919923Abstract: The invention provides for tripyrrane compounds of the formula ##STR1## wherein: each Q represents, typically, an alkyl group, cycloalkyl group, aryl group, or a heteroaryl group; and each R represents hydrogen, an alkyl group, alcohol group, or a carbonyl-containing group. Additionally, there are described methods to prepare such compounds, for example, comprising the steps of:(a) reacting a compound of the formula:Q--CHO or Q--CH(OS)(OS')wherein S and S' are independently lower alkyl, an aryl group containing from 5 to 14 ring atoms, and --(CH.sub.2).sub.n -- where n=2-4;with a stoichiometric excess of a pyrrole having the formula: ##STR2## in the presence of a catalytic amount of an acid; (b) removing the unreacted pyrrole or any other solvents used in (a) by evaporation to form a residue; and(c) treating the residue to remove high molecular weight polymeric materials and the corresponding dipyrromethane by-product, leaving the desired compound.Type: GrantFiled: May 19, 1998Date of Patent: July 6, 1999Inventors: Christian Bruckner, Ross W. Boyle, David Dolphin
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Patent number: 5883246Abstract: A compound of Formula I: ##STR1## wherein: Q represents identical alkyl groups, cycloalkyl groups having from 5 to 7 ring atoms, or aryl or heteroaryl groups having from 5 to 12 ring atoms andR represents identical hydrogen, alkyl, alcohol or carbonyl-containing groups;or a composition containing from 5 to 100 mole % by weight of the compound of Formula I. A novel method for synthesizing the compound of Formula I comprises the steps of: (a) reacting a compound of the formula:Q--CHO or Q--CH(OS)(OS')wherein Q is as defined above andS and S' are independently lower alkyl, an aryl group containing from 5 to 14 ring atoms, and --(CH.sub.2).sub.n -- where n=2-4, with an excess amount of a pyrrole in the presence of a catalytic amount of a strong Lewis or Bronsted acid;(b) removing any unreacted pyrrole or other solvents used by evaporation;(c) removing polymeric materials and removing the corresponding dipyrromethane by-product, leaving the compound of Formula I.Type: GrantFiled: March 7, 1996Date of Patent: March 16, 1999Assignee: QLT PhotoTherapeutics, Inc.Inventors: Christian Bruckner, Ross W. Boyle, David Dolphin
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Patent number: 5880145Abstract: New compounds expanding the repertoire of compounds useful in photodynamic therapy are described. Monohydrobenzoporphyrins can be obtained in the triacid form or as esters with heteroatom-substituted alcohols, or as amides.Type: GrantFiled: August 26, 1997Date of Patent: March 9, 1999Assignee: The University of British ColumbiaInventors: Ethan D. Sternberg, David Dolphin, Andrew Tovey, Anna M. Richter, Julia G. Levy
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Patent number: 5831088Abstract: A .beta.,.beta.'-dihydroxy meso-substituted chlorin, bacteriochlorin or isobacteriochlorin compound having the formula (I) or (II): ##STR1## wherein M is a metal. A novel method for synthesizing the compound of formula (I) or (II) comprises the steps of:a. osmylating a .beta...beta.'-unsubstituted, meso-substituted porphyrin to form an osmate ester at the .beta.,.beta.'-position, andb. reducing the osmate ester to form the corresponding .beta.,.beta.'-dihydroxy meso-substituted chlorin, bacteriochlorin or isobacteriochlorin of formula (I) or (II).Type: GrantFiled: May 8, 1997Date of Patent: November 3, 1998Assignee: The University of British ColumbiaInventors: David Dolphin, Christian Bruckner
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Patent number: 5808054Abstract: A compound of Formula I: ##STR1## wherein: Q represents identical alkyl groups, cycloalkyl groups having from 5 to 7 ring atoms, or aryl or heteroaryl groups having from 5 to 12 ring atoms andR represents identical hydrogen, alkyl, alcohol or carbonyl-containing groups;or a composition containing from 5 to 100 mole % by weight of the compound of Formula I. A novel method for synthesizing the compound of Formula I comprises the steps of:(a) reacting a compound of the formula:Q--CHO or Q--CH(OS)(OS')wherein Q is as defined above and S and S' are independently lower alkyl, an aryl group containing from 5 to 14 ring atoms, and --(CH.sub.2).sub.n -- where n=2-4, with an excess amount of a pyrrole in the presence of a catalytic amount of a strong Lewis or Bronsted acid;(b) removing any unreacted pyrrole or other solvents used by evaporation;(c) removing polymeric materials and removing the corresponding dipyrromethane by-product, leaving the compound of Formula I.Type: GrantFiled: March 7, 1996Date of Patent: September 15, 1998Assignee: QLT PhotoTherapeutics, Inc.Inventors: Christian Bruckner, Ross W. Boyle, David Dolphin
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Patent number: 5780622Abstract: A novel 5,15-diarylbenzochlorin-7-one compound having the formula (I) or (II): ##STR1## wherein M is a metal. A novel method for synthesizing the compound of formula (I) comprises the steps of:a. cyclizing a meso-(formylvinyl) 5,15-diarylporphyrin to form a cyclization reaction mixture, andb. oxidizing said reaction mixture to form the 5,15-diarylbenzochlorin-7-one of formula (I).A novel method for synthesizing the compound of formula (II) comprises the cyclizing and oxidizing steps listed above and, either prior to or after the oxidizing step, adding the step of demetallating the compound.Type: GrantFiled: August 11, 1997Date of Patent: July 14, 1998Assignee: The University of British ColumbiaInventors: David Dolphin, Ross Boyle
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Patent number: 5726304Abstract: Compounds of the formula ##STR1## and the metalated forms and salts thereof; wherein n is an integer of 1-4; andwherein each P.sub.i is independently a pyrrole residue of the formula ##STR2## wherein each R.sub.ia and R.sub.ib is independently a noninterfering substituent, andwherein each Z.sub.i is independently a covalent bond; or isa meso bridging group of the formula ##STR3## or is an N-meso bridging group of the formula.dbd.N--.revreaction.--N.dbd.; or isa CC linkage of the formula ##STR4## or is a CNCCNC linkage of the formula ##STR5## wherein each R.sub.ic, R.sub.id, R.sub.ie, R.sub.if and R.sub.ig is independently a noninterfering substituent; or isa CNC linkage of the formula--CH.dbd.N--CH.dbd..revreaction..dbd.CH--N.dbd.CH--wherein at least one Z.sub.i is said CNC linkage, are disclosed. These compounds are useful in photodynamic therapy and diagnosis. The metalated forms when the metal is paramagnetic are useful as MRI contrast agents.Type: GrantFiled: April 26, 1994Date of Patent: March 10, 1998Assignee: The University of British ColumbiaInventors: Hang Tang, Lily Y. Xie, Tilak Wijesekera, David Dolphin, Ross W. Boyle
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Patent number: 5703230Abstract: A meso-monoiodo-substituted tetramacrocyclic compound having the formula (I): ##STR1## wherein: each of A through D is independently a 5-membered, nitrogen-containing ring having the members necessary to complete a porphyrin, chlorin, bacteriochlorin or isobacteriochlorin nucleus;R.sub.1 through R.sub.8 are independently a hydrogen atom, a lower alkyl group, a lower alkyl carboxylic acid or acid ester group, keto, hydroxy, nitro, amino, or a group that, taken together with another ring, ring substituent or meso-substituent, forms a fused 5- or 6-membered ring; andeach of S.sup.1 through S.sup.3 is H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, a substituted or unsubstituted aromatic ring, or a substituted or unsubstituted heterocyclic ring. A method for synthesizing the compound comprises the step of iodinating a corresponding unhalogenated, de-metallated tetramacrocyclic compound, followed by metallating.Type: GrantFiled: December 2, 1994Date of Patent: December 30, 1997Assignee: University of British ColumbiaInventors: Ross W. Boyle, David Dolphin, Claire K. Johnson
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Patent number: 5656756Abstract: A novel 5,15-diarylbenzochlorin-7-one compound having the formula (I) or (II): ##STR1## wherein M is a metal. A novel method for synthesizing the compound of formula (I) comprises the steps of:a. cyclizing a meso-(formylvinyl) 5,15-diarylporphyrin to form a cyclization reaction mixture, andb. oxidizing said reaction mixture to form the 5,15-diarylbenzochlorin-7-one of formula (I).A novel method for synthesizing the compound of formula (II) comprises the cyclizing and oxidizing steps listed above and, either prior to or after the oxidizing step, adding the step of demetallating the compound.Type: GrantFiled: April 29, 1994Date of Patent: August 12, 1997Assignee: The University of British ColumbiaInventors: David Dolphin, Ross Boyle