作者:Stephen G. Davies、Andrew W. Mulvaney、Angela J. Russell、Andrew D. Smith
DOI:10.1016/j.tetasy.2007.06.008
日期:2007.7
array of 30 β-aminoacids of high enantiomeric purity using the conjugate addition of homochiral lithium N-benzyl-N-(α-methylbenzyl)amide as the key step is accomplished. The experimental simplicity and highly practical nature of the protocol is demonstrated by the efficient parallel conversion of 15 α,β-unsaturated esters to both enantiomeric series of the corresponding β-aminoacids in high overall
Use of (S)-N-tert-butoxycarbonylaziridine-2-carboxylate derivatives for α-amino acid synthesis
作者:Jack E. Baldwin、Christopher N. Farthing、Andrew T. Russell、Christopher J. Schofield、Alan C. Spivey
DOI:10.1016/0040-4039(96)00676-4
日期:1996.5
(S)-tert-Butyl-N-tert-butoxycarbonylaziridine-2-carboxylate and (S)-tert-butyl-N-tert-butoxycarbonylaziridine-2-carboxamide were synthesised and found to react with copper ‘catalysed’ Grignard reagents to give protected α-aminoacids in moderate to good yields.
Imidazolylidene carbene ligated palladium catalysis of the Heck reaction in the presence of air
作者:Jingping Liu、Yuanhong Zhao、Yongyun Zhou、Liang Li、Tony Y. Zhang、Hongbin Zhang
DOI:10.1039/b306715g
日期:——
Five 1,3-disubstituted imidazolium salts were synthesized. Their Heck reaction activities were evaluated. A convenient, efficient and high yielding procedure based on these compounds for the arylation of olefins was developed. Heck reactions mediated by these palladium–N-heterocyclic carbene complexes were conducted under air and even in the presence of several common oxidants.
Homochiral lithium amides for the asymmetric synthesis of β-amino acids
作者:Stephen G. Davies、Narciso M. Garrido、Dennis Kruchinin、Osamu Ichihara、Luke J. Kotchie、Paul D. Price、Anne J. Price Mortimer、Angela J. Russell、Andrew D. Smith
DOI:10.1016/j.tetasy.2006.05.008
日期:2006.7
Secondary homochiral lithium amides derived from α-methylbenzylamine undergo highly diastereoselective conjugate additions to a range of α,β-unsaturated esters. The corresponding β-aminoacids are readily liberated by successive N-debenzylation and ester hydrolysis, furnishing (R)-β-amino butyric acid, (R)-β-amino pentanoic acid, (S)-β-leucine, (R)-β-amino octanoic acid, (S)-β-phenylalanine, (S)-β-tyrosine
Asymmetric Synthesis of 3,4,5,6-Tetrasubstituted Piperidin-2-ones by Three-Component Coupling
作者:Stephen Davies、Andrew Smith、Andrew Cowley
DOI:10.1055/s-2004-830887
日期:——
The asymmetric three-component coupling of α,β-unsaturated esters and alkylidene malonates initiated with a homochiral lithium amide proceeds with high levels of diastereoselectivity, with hydrogenation of the resultant α-substituted β-amino acid derivatives giving a range of differentially protected 3,4,5,6-tetrasubstituted piperidinones with four contiguous stereogenic centres.