Preparation of β-Amino Esters and β-Lactams from Nitriles via Aldimine-Borane Complexes
摘要:
A one-pot synthesis of beta-amino esters has been achieved in 59-75% yield from aromatic and aliphatic nitrites via the condensation of the corresponding non-enolizable and enolizable aldimine-triethylborane complexes, respectively with methyl trimethylsilyl ketene acetals. Grignard-mediated lactamization of the intermediate beta-amino esters provides the corresponding beta-lactams in the same pot in 58-74% overall yield.
A highly efficient Gilman-Speeter synthesis of 3,4-trisubstituted β-lactams possessing a 4-aryl substituent is described, employing a direct, uncatalyzed Mannich reaction between TMS imines and TMS ketene acetals. The process avoids cryogenic conditions, making it more amenable to process-scale use than related methods for β-lactam synthesis. A Gilman-Speeter diastereoselective version using a sulfinyl
FIBRINOGEN RECEPTOR ANTAGONISTS HAVING SUBSTITUTED (b)-AMINO ACID RESIDUES AND PHARMACEUTICAL COMPOSITIONS COMPRISING THE SAME
申请人:NIPPON STEEL CORPORATION
公开号:EP0800516A1
公开(公告)日:1997-10-15
US5866592A
申请人:——
公开号:US5866592A
公开(公告)日:1999-02-02
[EN] FIBRINOGEN RECEPTOR ANTAGONISTS HAVING SUBSTITUTED beta -AMINO ACID RESIDUES AND PHARMACEUTICAL COMPOSITIONS COMPRISING THE SAME<br/>[FR] ANTAGONISTES DES RECEPTEURS DU FIBRINOGENE PRESENTANT DES RESTES DE beta - AMINOACIDES SUBSTITUES ET PREPARATIONS PHARMACEUTIQUES LES COMPRENANT
申请人:NIPPON STEEL CORPORATION
公开号:WO1996020172A1
公开(公告)日:1996-07-04
(EN) Compounds of general formula (I) and pharmaceutically acceptable salts thereof.(FR) L'invention porte sur des composés de formule générale (I) et leurs sels pharmacocompatibles.