Stereocontrolled Synthesis of Methyl αR,2S,3R-3-(l-Acetoxyethyl)-1- (4-methoxyphenyl)-4-oxoazetidine-2-carboxylate
摘要:
A stereocontrolled synthesis of the key intermediates for 2-iso-oxa- and 2-isocephems is described The absolute configuration of the title ester 8a is unambiguously determined by using X-ray analysis.
Stereocontrolled Synthesis of Methyl αR,2S,3R-3-(l-Acetoxyethyl)-1- (4-methoxyphenyl)-4-oxoazetidine-2-carboxylate
摘要:
A stereocontrolled synthesis of the key intermediates for 2-iso-oxa- and 2-isocephems is described The absolute configuration of the title ester 8a is unambiguously determined by using X-ray analysis.
An efficient synthesis of (3R,4R)-3-(1-(R)-hydroxyethyl)-4-(benzoyloxy)-2-azetidinone from L-threonine. Use of phenylalkoxymethyl as a novel N-protecting group
作者:Samuel Chackalamannil、Naomi Fett、Michael Kirkup、Adriano Afonso、Ashit K. Ganguly
DOI:10.1021/jo00237a050
日期:1988.1
Novel Functionalized Acylphosphonates as Phosphonoformate Analogs
作者:Alan R. Glabe、Katherine L. Sturgeon、Sally B. Ghizzoni、W. Kenneth Musker、Joyce N. Takahashi
DOI:10.1021/jo9611834
日期:1996.1.1
Synthesis of pure methyl [(2S,3R,αR)-1-(3-bromo-4-methoxyphenyl)-3-(α-acetoxy)ethyl-4-oxoazetidin-2-carboxylate] and its enantiomer
Synthesis of key intermediates leading to 2-iso-oxacephems was carried out starting from L- and D-threonine. As predicted in our previous paper (Tetrahedron Lett. 1995, 36, 8303-8306) all diastereomers of 2-iso-oxacephems can be prepared from the appropriate enantiomers of the amino acid threonine. The absolute configuration of the 2,3- and alpha -carbon atoms in the beta -lactam structure was determined by X-ray crystallographic studies. (C) 2001 Elsevier Science Ltd. All rights reserved.