Abstract: The invention relates to a novel process for the preparation of (R)-2-amino-6-n-propylamino-4,5,6,7-tetrahydrobenzothiazole, or a salt thereof.
Type:
Application
Filed:
April 19, 2012
Publication date:
October 4, 2012
Applicant:
Dipharma S.p.A.
Inventors:
Pietro ALLEGRINI, Gabriele Razzetti, Vittorio Lucchini
Abstract: A process for the purification of 1,4-butanediol mononitrate from 1,4-butanediol dinitrate and 1,4-butanediol, by selective extraction with solvents is herein disclosed.
Abstract: A process for the preparation of compounds of formula HO-A-ONO2??(I) wherein A is a C2-C6 alkylene chain by nitration of the corresponding alkanediols with “stabilized” nitric acid is herein disclosed. The process is safer to operators and allows to obtain advantageous yields on an industrial scale.
Abstract: The invention provides novel crystalline forms of fexofenadine hydrochloride, a process for the preparation of the novel forms and of the known form A, and their use in therapy.
Type:
Application
Filed:
October 28, 2008
Publication date:
April 30, 2009
Applicant:
DIPHARMA S.P.A.
Inventors:
Graziano CASTALDI, Giuseppe BARRECA, Pietro ALLEGRINI, Gianpiero VENTIMIGLIA
Abstract: A process for the purification of 1,4-butanediol mononitrate from 1,4-butanediol dinitrate and 1,4-butanediol, by selective extraction with solvents is herein disclosed.
Abstract: A novel process for the preparation of tolterodine, i.e. (R)—N, N-diisopropyl-3-(2-hydroxy-5-methylphenyl)-3-phenylpropanamine, in the racemic form, as well as intermediates useful for its preparation.
Type:
Grant
Filed:
December 14, 2007
Date of Patent:
September 2, 2008
Assignee:
Dipharma S.p.A.
Inventors:
Gabriele Razzetti, Simone Mantegazza, Roberto Rossi, Pietro Allegrini
Abstract: A process for the preparation of compounds of formula HO-A-ONO2 ??(I) wherein A is a C2-C6 alkylene chain by nitration of the corresponding alkanediols with “stabilised” nitric acid is herein disclosed. The process is safer to operators and allows to obtain advantageous yields on an industrial scale.
Abstract: A process for the preparation of phenyltetrazole derivatives of formula (II) wherein R and Y are as defined in the disclosure, by direct ortho-metallation of (tetrazol-5-?l)benzene. The compounds of formula (II) are useful intermediates for the preparation of angiotensin II antagonists.
Type:
Grant
Filed:
July 30, 2004
Date of Patent:
June 10, 2008
Assignee:
Dipharma S.p.A.
Inventors:
Graziano Castaldi, Pietro Allegrini, Gabriele Razzetti, Alberto Bologna, Marcello Rasparini, Vittorio Lucchini
Abstract: Novel phenyltetrazole compounds useful as intermediates in the preparation of angiotensin II antagonists and the processes for the conversion thereof to biologically active molecules.
Abstract: A novel process for the preparation of tolterodine, i.e. (R)—N,N-diisopropyl-3-(2-hydroxy-5-methylphenyl)-3-phenylpropanamine, in the racemic form, as well as intermediates useful for its preparation.
Type:
Application
Filed:
December 14, 2007
Publication date:
April 24, 2008
Applicant:
DIPHARMA S.P.A.
Inventors:
Gabriele Razzetti, Simone Mantegazza, Roberto Rossi, Pietro Allegrini
Abstract: A process for the preparation of benzo[d]isoxazol-3-yl-methanesulfonic acid of formula (I), or a salt thereof, and the intermediates thereof, useful as an intermediate in the preparation of zonisamide.
Type:
Application
Filed:
October 4, 2007
Publication date:
April 3, 2008
Applicant:
DIPHARMA S.P.A.
Inventors:
GABRIELE RAZZETTI, SIMONE MANTEGAZZA, GRAZIANO CASTALDI, PIETRO ALLEGRINI, VITTORIO LUCCHINI, ALBERTO BOLOGNA
Abstract: A process for the preparation of a compound of formula (I), or a salt thereof wherein R is H, C1-C8 alkyl, aryl or aryl-C1-C8 alkyl; comprising the reaction between a compound of formula (II) wherein R1 and R2 are independently hydrogen, C1-C8 alkyl, aryl, aryl-C1-C8 alkyl, or R1 and R2, taken together, form a —(CH2)m—V—(CH2)n— group, in which V is NR3 or C(R3)2 wherein R3 is hydrogen, C1-C8 alkyl, aryl or aryl-C1-C8 alkyl; and m and n, which can be the same or different, are 1 or 2; with a compound of formula (III) in which R4 and R5 are independently C1-C8 alkyl, aryl or aryl-C1-C8 alkyl; in the presence of a Ni (II) salt, an organic ligand and a basic agent, to obtain a compound of formula (I) wherein R is C1-C8 alkyl, aryl or aryl-C1-C8 alkyl and, if desired, its conversion to a compound of formula (I) wherein R is hydrogen or to a salt thereof.
Abstract: Novel phenyltetrazole compounds useful as intermediates in the preparation of angiotensin II antagonists and the processes for the conversion thereof to biologically active molecules.