Patents by Inventor Ryoji Kikumoto
Ryoji Kikumoto 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: 5925760Abstract: A method for preparing N.sup.2 -(3-(a hydrogen atom or a lower alkyl)-8-quinolinesulfonyl)-N.sup.G -nitro-L-arginine which comprises the step of condensing N.sup.G -nitro-L-arginine and 3-(a hydrogen atom or a lower alkyl)-8-quinolinesulfonyl chloride. The method achieves an extremely efficient and high yield preparation of N.sup.2 -arylsulfonyl-L-arginineamides that are useful as active ingredients of medicaments. Also provided is a novel N.sup.2 -(3-(a hydrogen atom or a lower alkyl)-8-quinolinesulfonyl)-N.sup.G -nitro-L-arginine compound which can be used as synthetic intermediate for the manufacture of (2R,4R)-4-methyl-1-?N.sup.2 -(3-methyl-1,2,3,4-tetrahydro-8-quinolinesulfonyl)-L-arginyl!-2-piperidine -carboxylic acid.Type: GrantFiled: August 4, 1997Date of Patent: July 20, 1999Assignee: Mitsubishi Chemical CorporationInventor: Ryoji Kikumoto
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Patent number: 5141947Abstract: Disclosed herein is a fibrinolysis-enhancing agent comprising, as an effective ingredient, an N.sup.2 -arylsulfonyl-L-arginine amide represented by the general formula (I): ##STR1## wherein R.sup.1 is a group of the formula: ##STR2## where R.sup.3 is an alkyl group having 3 to 5 carbon atoms or an alkoxyalkyl group having 2 to 4 carbon atoms and R.sup.4 is an alkyl group having 1 to 3 carbon atoms; and R.sup.2 is a group of the formula: ##STR3## where R.sup.5 and R.sup.6 are independently hydrogen atom, methyl group or methoxy group provided that they cannot be hydrogen atoms simultaneously, and R.sup.7 is an alkyl group having 1 to 3 carbon atoms; or a salt thereof. The agent is used in combination with a plasminogen activator.Type: GrantFiled: September 12, 1991Date of Patent: August 25, 1992Assignee: Mitsubishi Kasei CorporationInventors: Yoshikuni Tamao, Ryoji Kikumoto
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Patent number: 5032614Abstract: A method of suppressing vasoconstriction in a warm-blooded animal which comprises administering to said warm-blooded animal an effective amount of a serotonin antagonist compound of the formula (I): ##STR1## wherein: R.sup.1 is hydrogen, halo, C.sub.1 -C.sub.5 alkoxy or C.sub.2 -C.sub.6 dialkyl amino;R.sup.2 is hydrogen, halo or C.sub.1 -C.sub.5 alkoxy;R.sup.3 is hydrogen, hydroxy, --O--(CH.sub.2).sub.n --COOH or --O--CO--(CH.sub.2).sub.l --COOH, wherein n is an integer of 1-5, and l is an integer of 1-3;R.sup.4 is ##STR2## wherein R.sup.5 and R.sup.6 are each independently hydrogen or C.sub.1 -C.sub.8 alkyl, and A is C.sub.3 -C.sub.5 alkylene or C.sub.3 -C.sub.5 alkylene substituted with carboxy; andm is an integer of 0-5,or a pharmaceutically acceptable salt thereof. The use of the compound (I) for the preparation of a pharmaceutical formulation useful as a serotonin antagonist is also provided.Type: GrantFiled: May 18, 1990Date of Patent: July 16, 1991Assignee: Mitsubishi Kasei CorporationInventors: Masanori Osakabe, Hiroto Hara, Yoshikuni Tamao, Ryoji Kikumoto
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Patent number: 4814507Abstract: A novel sulfone compound represented by the general formula (I) ##STR1## wherein R.sup.1 is cyclohexyl, phenyl; or a phenyl substituted with a group selected from nitro, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy and halogen; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are respectively hydrogen, halogen, cyano or carbonyl, wherein R.sup.1 and R.sup.2 may form an o-phenylene or an o-phenylene substituted with at least one group selected from nitro C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy and halogen; X is oxygen or methylkene; Y is -(CH.sub.2).sub.n --, wherein n is an integer of 0, 5 or 6, or ##STR2## wherein m is an integer 1-3; R.sup.6 is hydrogen, C.sub.1 -C.sub.3 alkyl, .omega.-alkylaminoalkyl, wherein each alkyl has 1-3 carbon atoms, or .omega.-dialkylaminoalkyl, wherein each alkyl has 1-3 carbon atoms; R.sup.7 is hydrogen or C.sub.1 -C.sub.3 alkyl; and R.sup.6 and R.sup.7 may form a ring together with N, or ##STR3## wherein R.sup.8 is hydrogen, C.sub.1 -C.sub.Type: GrantFiled: September 14, 1987Date of Patent: March 21, 1989Assignee: Mitsubishi Chemical Industries, LimitedInventors: Akihiro Tobe, Shinichiro Fujimori, Tomoshi Yamazaki, Mamoru Sugano, Ryoji Kikumoto, Issei Nitta
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Patent number: 4764618Abstract: Novel arginine derivatives represented by the general formula ##STR1## wherein R.sup.1 stands for a naphthalenesulfonyl, a naphthalenecarbonyl, a 1,2,3,4-tetrahydronaphthalenesulfonyl, a 1,2,3,4-tetrahydronaphthalenecarbonyl, a dioxa b-6,7-naphthalenesulfonyl, a dioxa b-6,7-naphthalenecarbonyl, a 1,2,3,4-tetrahydro-8-quinolinesulfonyl, a 1,2,3,4-tetrahydro-8-quinolinecarbonyl, a dibenzofuransulfonyl, a dibenzofurancarbonyl, a fluorenesulfonyl, a fluorenecarbonyl, a dibenzothiophenesulfonyl or a dibenzothiophene, and R.sup.2 stands for a piperidino or a piperazino are disclosed. These arginine derivatives and their pharmaceutically acceptable salts have trypsin-inhibiting activity and useful as a pancreatitis remedy.Type: GrantFiled: June 19, 1987Date of Patent: August 16, 1988Assignee: Mitsubishi Chemical Industries LimitedInventors: Ryoji Kikumoto, Yoshikuni Tamao, Shinji Tonomura, Akira Maruyama, Shosuke Okamoto, Akiko Okunomiya
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Patent number: 4734500Abstract: A novel sulfone compound represented by the general formula (I) ##STR1## wherein R.sup.1 is cyclohexyl, phenyl; or a phenyl substituted with a group selected from nitro, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy and halogen; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are respectively hydrogen, halogen, cyano or carbonyl, wherein R.sup.1 and R.sup.2 may form an o-phenylene or an o-phenylene substituted with at least one group selected from nitro C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy and halogen; X is oxygen or methylene; Y is --(CH.sub.2).sub.n --, wherein n is an integer of 0, 5 or 6, or ##STR2## wherein m is an integer 1-3; R.sup.6 is hydrogen, C.sub.1 -C.sub.3 alkyl, .omega.-alkylaminoalkyl, wherein each alkyl has 1-3 carbon atoms, or .omega.-dialkylaminoalkyl, wherein each alkyl has 1-3 carbon atoms; R.sup.7 is hydrogen or C.sub.1 -C.sub.3 alkyl; and R.sup.6 and R.sup.7 may form a ring together with N, or ##STR3## wherein R.sup.8 is hydrogen, C.sub.1 -C.sub.Type: GrantFiled: March 11, 1986Date of Patent: March 29, 1988Assignee: Mitsubishi Chemical Industries LimitedInventors: Akihiro Tobe, Shinichiro Fujimori, Tomoshi Yamazaki, Mamoru Sugano, Ryoji Kikumoto, Issei Nitta
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Patent number: 4716161Abstract: A phenylpiperazine derivative according to the present invention has the following general formula [I]: ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are independently hydrogen or alkoxy group having 1 to 3 carbon atoms, orR.sup.1 and R.sup.2 or R.sup.2 and R.sup.3 together with carbon atoms to which they are attached form --O(CH.sub.2).sub.m O-- wherein m is an integer of 1 to 3, oreither R.sup.1 or R.sup.2 is amine residue selected from the group consisting of --NH.sub.2 , --NHSO.sub.2 CH.sub.3, --NHCOCH.sub.3 and --NHCONH.sub.2 and the other is hydrogen or alkoxy group of 1 to 3 carbon atoms and R.sup.3 is hydrogen;R.sup.4 and R.sup.5 are independently hydrogen or alkyl group of 1 to 3 carbon atoms;Y is --CO-- or --SO.sub.2 -- provided that at least one of R.sup.1 and R.sup.2 is not hydrogen when Y is --CO--; andn is an integer of 2 to 4.An acid addition salt of the phenylpiperazine derivative having the general formula [I] is included in the present invention.Type: GrantFiled: April 3, 1985Date of Patent: December 29, 1987Assignee: Mitsubishi Chemical Industries LimitedInventors: Harukazu Fukami, Ryoji Kikumoto, Kenichiro Nakao, Issei Nitta, Shinya Inoue
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Patent number: 4695568Abstract: This invention relates novel thieno[2,3-d]pyrimidine derivatives represented by the following general formula (I): ##STR1## or salts thereof; wherein R.sup.1 and R.sup.2 independently represent hydrogen, halogen or alkyl group having 1 to 6 carbon atoms; or R.sup.1 and R.sup.2 may concatenate to form a cycloalkylene group having 5 or 6 ring carbon atoms; R.sup.3 and R.sup.4 independently represent hydrogen or alkyl group having 1 to 6 carbon atoms; R.sup.5 represents a member selected from(1) hydrogen or alkyl having 1 to 6 carbon atoms,(2) ##STR2## in which m is an integer of from 1 to 3 and X represents halogen, or (3) ##STR3## in which R.sup.6 represents alkyl group having 1 to 6 carbon atoms; Ar represents substituted or unsubstituted phenyl, or 2- or 3-thienyl group; and n is 2 or 3. The derivatives of the invention can be used in the treatment of the various depression disease or the higher dysfunction of the brain.Type: GrantFiled: December 24, 1984Date of Patent: September 22, 1987Assignee: Mitsubishi Chemical Industries LimitedInventors: Kunihiro Ninomiya, Issei Nitta, Akihiro Tobe, Mitsuo Egawa, Ryoji Kikumoto
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Patent number: 4684651Abstract: Alkylenedioxybenzene derivatives are prepared and found to be useful as pharmaceutical agents, particularly as hypotensives.Type: GrantFiled: February 26, 1982Date of Patent: August 4, 1987Assignee: Mitsubishi Chemical Industries LimitedInventors: Ryoji Kikumoto, Harukazu Fukami, Kenichiro Nakao, Mamoru Sugano
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Patent number: 4684739Abstract: Alkylenedioxybenzene derivatives are prepared and found to be useful as pharmaceutical agents, particularly as hypotensives.Type: GrantFiled: December 1, 1981Date of Patent: August 4, 1987Assignee: Mitsubishi Chemical Industries LimitedInventors: Ryoji Kikumoto, Harukazu Fukami, Kenichiro Nakao, Mamoru Sugano
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Patent number: 4670420Abstract: N.sup.2 -dansyl-L-arginine esters and amides having the formula ##STR1## or the acid addition salts thereof with a pharmaceutically acceptable acid, wherein R is selected from the group consisting of (1) alkoxy, alkenyloxy, alkynyloxy, and cycloalkoxy, respectively, containing not more than 10 carbon atoms, aralkyl of not more than 15 carbon atoms, tetrahydrofurfuryloxy, and alkoxy of not more than 10 carbon atoms substituted with an alkoxy group of not more than 10 carbon atoms, halogen or nitro; (2) ##STR2## wherein R.sub.1 and R.sub.Type: GrantFiled: February 4, 1980Date of Patent: June 2, 1987Assignees: Mitsubishi Chemical Industries Limited, Shosuke OkamotoInventors: Shosuke Okamoto, Ryoji Kikumoto, Yoshikuni Tamao, Shinji Tonomura, Kazuo Ohkubo
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Patent number: 4613598Abstract: A piperazine derivative according to the present invention has the following general formula [I]: ##STR1## wherein R.sup.1 is --OH, --OR.sup.3, --SR.sup.3, --SOR.sup.3 or --SO.sub.2 R.sup.3 wherein R.sup.3 is alkyl group having 1 to 3 carbon atoms;R.sup.2 is --SO.sub.2 NH.sub.2, --SO.sub.2 NHR.sup.4, --SO.sub.2 NR.sup.4 R.sup.5, --COOH, --COOR.sup.4, --CONH.sub.2, --CONHR.sup.4, --CONR.sup.4 R.sup.5, --NHCONH.sub.2, --NHCSNH.sub.2, --NHCONHR.sup.4, --NHCOR.sup.4 or --NHSO.sub.2 R.sup.4 wherein R.sup.4 and R.sup.5 are independently alkyl group having 1 to 3 carbon atoms; orR.sup.1 and R.sup.2 together with carbon atoms to which they are attached form ##STR2## Z is --CO-- or --CH(OH)--; Ar is pyridyl or substituted or unsubstituted phenyl; andn is an integer of 3 to 5.An acid addition salt of the piperazine derivative having the above formula [I] is included in the present invention.Type: GrantFiled: March 6, 1985Date of Patent: September 23, 1986Assignee: Mitsubishi Chemical Industries LimitedInventors: Harukazu Fukami, Shinya Inoue, Issei Nitta, Kenichiro Nakao, Ryoji Kikumoto
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Patent number: 4599419Abstract: (3-Aminopropoxy)bibenzyl derivatives are prepared and found useful as pharmaceutical agents, particularly as inhibitors of platelet aggregation.Type: GrantFiled: July 9, 1984Date of Patent: July 8, 1986Assignee: Mitsubishi Chemical Industries, Inc.Inventors: Ryoji Kikumoto, Harukazu Fukami, Hiroto Hara, Kunihiro Ninomiya, Mamoru Sugano
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Patent number: 4562211Abstract: 2-Substituted-1-(omega-aminoalkoxy)benzenes are prepared and found useful as pharmaceutical agents, particularly as antidepressants.Type: GrantFiled: November 16, 1979Date of Patent: December 31, 1985Assignee: Mitsubishi Chemical Industries, Ltd.Inventors: Ryoji Kikumoto, Akihiro Tobe, Shinji Tonomura, Hidenobu Ikoma
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Patent number: 4485258Abstract: (3-Aminopropoxy)bibenzyl derivatives are prepared and found useful as pharmaceutical agents, particularly as inhibitors of platelet aggregation.Type: GrantFiled: July 29, 1982Date of Patent: November 27, 1984Assignee: Mitsubishi Chemical Industries LimitedInventors: Ryoji Kikumoto, Harukazu Fukami, Hiroto Hara, Kunihiro Ninomiya, Mamoru Sugano
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Patent number: 4339580Abstract: Piperazinylalkoxyindanes and their pharmaceutically acceptable acid addition salts which have anti-anxiety activity and are effective as sedatives.Type: GrantFiled: June 9, 1980Date of Patent: July 13, 1982Assignee: Mitsubishi Chemical Industries, LimitedInventors: Ryoji Kikumoto, Akihiro Tobe, Harukazu Fukami, Mitsuo Egawa
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Patent number: 4310534Abstract: 2-(4-aminobutoxy)stilbenes are prepared and found useful as pharmaceutical agents, particularly as anticonvulsants and skeletal muscle relaxants.Type: GrantFiled: July 30, 1980Date of Patent: January 12, 1982Assignee: Mitsubishi Chemical Industries LimitedInventors: Ryoji Kikumoto, Akihiro Tobe, Harukazu Fukami, Mitsuo Egawa, Kunihiro Ninomiya
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Patent number: 4284637Abstract: 2-(4-aminobutoxy)stilbenes are prepared and found useful as pharmaceutical agents, particularly as anticonvulsants and skeletal muscle relaxants.Type: GrantFiled: October 1, 1979Date of Patent: August 18, 1981Assignee: Mitsubishi Chemical Ind., LimitedInventors: Ryoji Kikumoto, Akihiro Tobe, Harukazu Fukami, Kunihiro Ninomiya, Mitsuo Egawa
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Patent number: 4258192Abstract: N.sup.2 -Arylsulfonyl-L-argininamides and the pharmaceutically acceptable salts thereof have been found to be effective as pharmaceutical agents for the inhibition and suppression of thrombosis in mammals.Type: GrantFiled: May 22, 1979Date of Patent: March 24, 1981Assignees: Mitsubishi Chemical Industries Limited, Shosuke OkamotoInventors: Shosuke Okamoto, Akiko Hijikata, Ryoji Kikumoto, Yoshikuni Tamao, Kazuo Ohkubo, Tohru Tezuka, Shinji Tonomura
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Patent number: 4227006Abstract: N.sup.2 -dansyl-L-arginine esters and amides or the acid addition salts thereof with a pharmaceutically acceptable acid have been found to be effective as pharmaceutical agents for the inhibition and suppression of thrombosis.Type: GrantFiled: June 1, 1976Date of Patent: October 7, 1980Assignee: Mitsubishi Chemical Industries Ltd.Inventors: Shosuke Okamoto, Ryoji Kikumoto, Yoshikuni Tamao, Shinji Tonomura, Kazuo Ohkubo