Asymmetric Conjugate Additions of Chiral Phosphonamide Anions to α,β-Unsaturated Carbonyl Compounds. A Versatile Method for Vicinally Substituted Chirons
作者:Stephen Hanessian、Arthur Gomtsyan、Nadia Malek
DOI:10.1021/jo000388g
日期:2000.9.1
Reactions of anions derived from chiral nonracemic allyl, crotyl, and cinnamyl bicyclic C(2)-symmetrical phosphonamides with alpha, beta-unsaturated cyclic ketones, esters, lactones, and lactams take place at the gamma-position of the reagents. The products are diastereomerically pure or enriched beta-substituted carbonylcompounds. The method also provides easy access to vicinal substitution of as
present on the heterocyclic ring is the main target of the synthesis. The described method allows to prepare the suitable optically pure 2-substituted primary alcohol by means of a Pseudomonas fluorescens lipase-catalyzed transesterification. The obtained (2R)-alcohol was easily transformed into the (3R)-3-propylbutyrolactone, an advanced intermediate of brivaracetam. The described synthetic pathway is completed
[EN] A NEW COST EFFECTIVE AND SCALABLE PROCESS FOR SYNTHESIZING PURE BRIVARACETAM<br/>[FR] NOUVEAU PROCÉDÉ RENTABLE ET ÉVOLUTIF POUR LA SYNTHÈSE DE BRIVARACÉTAM PUR
申请人:CLININVENT RES PVT LTD
公开号:WO2021260721A1
公开(公告)日:2021-12-30
The present invention relates to novel, economical processes for the preparation of enantiomerically pure Brivaracetam of Formula I having 99-100% diastereomeric excess (de) from its (R)-lactone intermediate that is (4R)-4-propyldihydrofuran-2(3H)-one.
[EN] ENANTIOSELECTIVE SYNTHESIS OF BRIVARACETAM AND INTERMEDIATES THEREOF<br/>[FR] SYNTHÈSE ÉNANTIOSÉLECTIVE DE BRIVARACÉTAM ET DE SES INTERMÉDIAIRES
申请人:CLININVENT RES PVT LTD
公开号:WO2020148787A1
公开(公告)日:2020-07-23
The present invention relates to an improved and economical process for enantioselective synthesis and purification of a novel key intermediate of Brivaracetam. Further, the present invention also relates to a process for the preparation of a chirally pure Brivaracetam of formula I utilizing the said intermediate.