Effective Methods for the Synthesis ofN-Methylβ-Amino Acids from All Twenty Commonα-Amino Acids Using 1,3-Oxazolidin-5-ones and 1,3-Oxazinan-6-ones
作者:Andrew B. Hughes、Brad E. Sleebs
DOI:10.1002/hlca.200690235
日期:2006.11
N-Methyl β-amino acids are generally required for application in the synthesis of potentially bioactive modified peptides and other oligomers. Previous work highlighted the reductive cleavage of 1,3-oxazolidin-5-ones to synthesise N-methyl α-amino acids. Starting from α-amino acids, two approaches were used to prepare the corresponding N-methyl β-amino acids. First, α-amino acids were converted to
作者:Young K. Chen、Masanori Yoshida、David W. C. MacMillan
DOI:10.1021/ja063267s
日期:2006.7.1
The first enantioselectiveorganocatalytic amine conjugateaddition has been successfully developed. The application of LUMO-lowering iminium catalysis has enabled the highly chemo- and enantioselective 1,4-addition of a rationally designed N-silyloxycarbamate nucleophile (HOMO-raised) to alpha,beta-unsaturated aldehydes. Imidazolidinone 2*pTSA was found to catalyze the addition of various orthogonally
Kantharaju; Suresh Babu, Vommina V., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2004, vol. 43, # 10, p. 2152 - 2158
作者:Kantharaju、Suresh Babu, Vommina V.
DOI:——
日期:——
Convenient in situ synthesis of nonracemic N-protected β-amino aldehydes from β-amino acids. Applications in Wittig reactions and heterocycle synthesis
作者:Simon B. Davies、M.Anthony McKervey
DOI:10.1016/s0040-4039(98)02573-8
日期:1999.2
N-Z-γ-amino alcohols derived from nonracemic β-amino acids are smoothly oxidised by manganese dioxide in acetonitrile to afford aldehydes which can be trapped in situ in Wittig reactions with carbonyl-substituted phosphoranes. The application of this methodology to the synthesis of the alkaloids (S)-(+)-N-BOC-coniie, (S)-(−)-coniceine and a pipecoline precursor is described.
源自非外消旋β-氨基酸的N - Z -γ-氨基醇在乙腈中被二氧化锰平滑氧化,得到醛,这些醛可在Wittig反应中与羰基取代的磷烷原位捕获。描述了该方法在生物碱(S)-(+)- N -BOC-coniie,(S)-(-)-coniceine和胡椒碱前体的合成中的应用。