Selective amine de-alkylation enables the conversion of Sommelet–Hauserrearrangement products into 2-aryl-2-bromoacetic acid derivatives. These compounds are valuable synthetic intermediates in the synthesis of α-aryl-α-amino or α-aryl-β-amino acid derivatives. The method presented herein is a formal de-N,N-dialkylation of Sommelet–Hauserrearrangement products.
A novel palladium-catalyzed homocoupling reaction initiated by transmetallation of palladium enolates
作者:Aiwen Lei、Xumu Zhang
DOI:10.1016/s0040-4039(02)00328-3
日期:2002.4
Palladium-catalyzed homocouplingreaction of aryl boronic acids has been developed using a protocol similar to the well-documented crosscoupling reaction. α-Halocarbonyl compounds are applied to initiate the reaction via oxidative addition to a palladium(0) species. The resulting palladium enolate halide can promote the double transmetallation. Reductive elimination generates the desire homocoupling product.
A method for the bromination of α‐diazo phenylacetate derivatives using cobalt(II) bromide is described. This bromination reaction features a short reaction time, broad substrate scope, operational simplicity, acid‐free conditions, and gram‐scalability.
Angiotensin II antagonists incorporating a substituted benzyl element
申请人:Merck & Co., Inc.
公开号:US05449682A1
公开(公告)日:1995-09-12
Substituted heterocycles attached through a methylene bridge to novel substituted phenyl derivatives of the Formula I are useful as angiotensin II antagonists. ##STR1## wherein the substituents are as defined in the claims.
Angiotensin II antagonists incorporating a substituted pyridoimidazolyl
申请人:Merck & Co., Inc.
公开号:US05240938A1
公开(公告)日:1993-08-31
Substituted heterocycles attached through a methylene bridge to novel substituted phenyl derivatives of the Formula I are useful as angiotensin II antagonists. ##STR1##