Novel N → C acyl migration reaction of acyclic imides: A facile method for α-aminoketones and β-aminoalcohols
作者:Osamu Hara、Masao Ito、Yasumasa Hamada
DOI:10.1016/s0040-4039(98)01093-4
日期:1998.7
The acyclic imides derived from primary benzylic amines and amino acid esters easily undergo the novel N → C acyl migration reaction via a base-generated carbanion, yielding the corresponding α-aminoketones which are expedient precursors for β-aminoalcohols.
A new cost-effective Ru-chloramphenicol base derivative catalyst for the asymmetric transfer hydrogenation/dynamic kinetic resolution of N-Boc α-amino-β-ketoesters and its application to the synthesis of the chiral core of vancomycin
Herein we describe the application of a series of newly developed Ru-chloramphenicol base derivative complexes as catalysts for the highly diastereo- and enantioselective transferhydrogenation of N-Boc α-amino-β-ketoesters for the asymmetricsynthesis of anti-N-Boc-β-hydroxy-α-amino esters. This report highlights the utility of this catalytic methodology for the preparation of pharmaceutical compounds
A practical synthesis of α-acylamino-β-keto-esters: Acylation of alkyl hydrogen (acylamino)malonates via the MgCl2/R3N base system
作者:Damian J. Krysan
DOI:10.1016/0040-4039(96)00581-3
日期:1996.5
An operationally simple procedure for the synthesis of α-acylamino-β-keto-esters has been devised using a MgCl2/R3Nbasesystem to generate the magnesium enolates of a series of alkylhydrogen (acylamino)malonates. These reagents smoothly react at 0 °C with a variety of acid chlorides to give α-acylamino-β-keto-esters in good to excellent yields. In addition to being quite convenient and versatile
已经设计了使用MgCl 2 / R 3 N碱系统合成α-酰基氨基-β-酮基酯的操作简单的程序,以生成一系列烷基氢(酰基氨基)丙二酸烯醇镁。这些试剂可在0°C下与各种酰氯平稳反应,从而以良好或极佳的收率得到α-酰基氨基-β-酮酸酯。除了对于小规模制备非常方便和通用之外,该方法还应该非常适合于这种重要分子类别的大规模合成。
An enantioselective synthesis of nitrogen protected 3-arylserine esters
作者:Lisa H. Bourdon、David J. Fairfax、Gregory S. Martin、Casey J. Mathison、Pavel Zhichkin
DOI:10.1016/j.tetasy.2004.10.005
日期:2004.11
A method for the preparation of (2R,3S) nitrogen protected arylserine esters is described. The method consists of rhodium mediated insertion of tert-butylcarbamate into the corresponding 3-keto-2-diazoester, affording the N-protected alpha-amino-beta-ketoester, followed by asymmetric reduction/dynamic resolution to afford the corresponding N-protected 3-arylserine esters in good chemical yield, and in most cases high enantiomeric excess. (C) 2004 Elsevier Ltd. All rights reserved.