[EN] PREPARATION OF ESCITALOPRAM<br/>[FR] PREPARATION D'ESCITALOPRAME
申请人:REDDYS LAB INC DR
公开号:WO2005047274A1
公开(公告)日:2005-05-26
Enantiomerically enriched citalopram is prepared by methylating enantiomerically enriched didesmethylcitalopram, obtained by directly resolving racemic didesmethylcitalopram using a chiral acid.
[EN] PROCESSES FOR PREPARING 4-OXO-4-[3-(TRIFLUOROMETHYL)-5,6- DIHYDRO [L,2,41-TRIAZOLO[43-A]PYRAZIN-7(8H)-YL]-L-(2,4,5- TRIFLUOROPHENYL)BUTAN-2-AMINE<br/>[FR] PROCÉDÉS DE PRÉPARATION DE 4-OXO-4-[3-(TRIFLUOROMÉTHYL)-5,6-DIHYDRO- [L,2,4]TRIAZOLO[4,3-A]PYRAZIN-7(8H)-YL]-1-(2,4,5-TRIFLUOROPHÉNYL)- BUTAN-2-AMINE
申请人:CADILA HEALTHCARE LTD
公开号:WO2013065066A1
公开(公告)日:2013-05-10
The present invention relates to synthesis of 4-oxo-4-[3-(trifluoromethyl)-5,6- dihydro [l,2,4]-triazolo[4,3-a]pyrazin-7(8H)-yl]-l-(2,4,5-trifluorophenyl)butan-2- amine of Formula (I) either in its racemic (R/S) form or any of its optically active (S) or (R) forms or enantiomeric excess mixture of any of the forms by novel processes. The invention further relates to certain novel intermediates useful in the preparation of compound of Formula (I) and processes for their preparation.
[EN] PROCESSES FOR THE PREPARATION OF SUBSTITUTED TETRAHYDRO BETA-CARBOLINES<br/>[FR] PROCÉDÉS DE PRÉPARATION DE TÉTRAHYDRO BÊTA-CARBOLINES SUBSTITUÉES
申请人:PTC THERAPEUTICS INC
公开号:WO2010138644A1
公开(公告)日:2010-12-02
Provided herein are improved processes for the synthesis of substituted tetrahydro beta-carboline derivatives. In particular, provided herein are improved processes useful for the preparation of (S)-4-chlorophenyl 6-chloro- 1 -(4-methoxyphenyl)-3,4-dihydro- 1 H-pyrido [3,4-b]indole-2(9H)-carboxylate. Formula (I)
PROCESS FOR PREPARATION OF (2R)-4-OXO-4-[3- (TRIFLUOROMETHYL)-5,6-DIHYDRO [1,2,4]-TRIAZOLO[4,3-A]PYRAZIN- 7(8H)-YL]-L-(2,4,5-TRIFLUOROPHENYL)BUTAN-2-AMINE & NEW IMPURITIES IN PREPARATION THEREOF
申请人:Kothari Himanshu Madhusudan
公开号:US20110213149A1
公开(公告)日:2011-09-01
The present invention relates to synthesis of β-amino acid derivatives of formula (I) and its salts of formula (Ia) by a novel process. The process comprises the reduction of a protected or unprotected prochiral β-amino acrylic acid or derivative there of, by using borane containing reducing agents at atmospheric pressure. The resulting racemic β-amino compound is resolved to a pure stereoisomer of formula (I), specifically to (2R)-4-oxo-4-[3-Ctrifluoromethyl)-5,6-dihydrol[1,2,4]triazolo[4,3-alpyrazin-7(8H)-yl]-1-(2,4,4-trifluorophenyl)butan-2-amine. In an embodiment the invention disclosed polymorphic forms of formula (I), phosphate salt of formula (I) and also a Dibenzoyl-L-tartaric acid salt of formula (I).