CONCISE BETA2-AMINO ACID SYNTHESIS VIA ORGANOCATALYTIC AMINOMETHYLATION
申请人:CHI Yonggui
公开号:US20080058548A1
公开(公告)日:2008-03-06
The present invention provides a method for the synthesis of β
2
-amino acids. The method also provides methods yielding α-substituted β-amino aldehydes and β-substituted γ-amino alcohols. The present method according to this invention allows for increased yield and easier purification using minimal chromatography or crystallization. The methods described herein are based on an aldehyde aminomethylation which involves a Mannich reaction between an aldehyde and a formaldehyde-derived N,O-acetal (iminium precursor) and a catalyst, such as, for example, L-proline or a pyrrolidine. The invention allows for large scale, commercial preparation of β
2
-amino acids.
Enantioselective Organocatalytic Aminomethylation of Aldehydes: A Role for Ionic Interactions and Efficient Access to β<sup>2</sup>-Amino Acids
作者:Yonggui Chi、Samuel H. Gellman
DOI:10.1021/ja061731n
日期:2006.5.1
Organocatalytic Mannich addition of aldehydes to a formaldehyde-derived iminium species catalyzed by proline-derived chiral pyrrolidines provides beta-amino aldehydes with >/=90% ee. Mechanistic analysis of the proline-catalyzed reactions suggests that non-hydrogen-bonded ionic interactions at the Mannich reaction transition state can influence stereochemical outcome. The beta-amino aldehydes from our process bear a substituent adjacent to the carbonyl and can be efficiently converted to protected beta2-amino acids, which are important building blocks for beta-peptide foldamers that display useful biological activities.
US7820858B2
申请人:——
公开号:US7820858B2
公开(公告)日:2010-10-26
[EN] CONCISE BETA2-AMINO ACID SYNTHESIS VIA ORGANOCATALYTIC AMINOMETHYLATION<br/>[FR] SYNTHÈSE RAPIDE DE BÊTA2 ACIDES AMINÉS VIA UNE AMINOMÉTHYLATION ORGANOCATALYTIQUE
申请人:WISCONSIN ALUMNI RES FOUND
公开号:WO2007112358A1
公开(公告)日:2007-10-04
[EN] The present invention provides a method for the synthesis of ß2-amino acids. The method also provides methods yielding a-substituted ß-amino aldehydes and ß-substituted ?-amino alcohols. The present method according to this invention allows for increased yield and easier purification using minimal chromatography or crystallization. The methods described herein are based on an aldehyde aminomethylation which involves a Mannich reaction between an aldehyde and a formaldehyde-derived N,O-acetal (iminium precursor) and a catalyst, such as, for example, L-proline or a pyrrolidine. The invention allows for large scale, commercial preparation of ß2-amino acids. [FR] La présente invention concerne un procédé pour la synthèse de ß2 acides aminés. L'invention concerne également des procédés produisant des ß-aminoaldéhydes substitués en a et des ?-aminoalcools substitués en ß. Le présent procédé selon cette invention permet un rendement de production accru et une purification plus facile en utilisant une chromatographie ou cristallisation minimale. Les procédés décrits dans la présente sont basés sur une aminométhylation d'aldéhydes qui met en jeu une réaction de Mannich entre un aldéhyde et un N,O-acétal dérivé du formaldéhyde (précurseur d'iminium) et un catalyseur, tel que, par exemple, la L-proline ou une pyrrolidine. L'invention permet la préparation industrielle à grande échelle de ß2 acides aminés.