A stereocontrolled approach to electrophilic epoxides
作者:Otto Meth-Cohn、Clive Moore、Heinrich C. Taljaard
DOI:10.1039/p19880002663
日期:——
Lithium t-butyl hydroperoxide (easily generated by addition of an alkyl-lithium to anhydrous t-butyl hydroperoxide in THF solution) is a powerful reagent for the epoxidation of electrophilic alkenes at –20 to 0 °C under full stereocontrol.
Preparation of dicarboxylate analogues of cerulenin
作者:Jonathan D. Moseley、James Staunton
DOI:10.1002/jhet.5570420511
日期:2005.7
We have proposed and synthesized several new structural classes of Ceruleninanalogues, which have potential as inhibitors of both fatty acid and polyketide synthase multi-enzyme complexes. These analogues contain cis epoxides bearing flanking carboxylate groups. Our syntheses have been designed to allow access to a wide range of fatty acid and polyketide-like side chains from readily available starting
Synthesis of an optically active 4-acetoxyazetidinone intermediate for penems and carbapenems
作者:Dieter Häbich、Wolfgang Hartwig、Liborius Born
DOI:10.1002/jhet.5570250225
日期:1988.3
The synthesis of the novel (3R,4R)-4-acetoxy-3-[(1S)-1-t- butyldimethylsilyloxymethyl-1-((1S)-1- phenylethylaminocarbonyl)]azetidin-2-one (1a), a valuable key intermediate for penems and carbapenems bearing a 6-hydroxyacetamide side chain, and its diastereomer 1b, from dimethyl cis-2,3-oxirane dicarboxylate, is described. The allocation of absolute configurations to the diastereomers 1a and 1b ensued
A powerful new stereo-controlled method for epoxidation of electrophilic alkenes
作者:Carol Clark、Patricia Hermans、Otto Meth-Cohn、Clive Moore、Heinrich C. Taljaard、Gerda van Vuuren
DOI:10.1039/c39860001378
日期:——
tetrahydrofuran are shown to epoxidise α,β-unsaturated esters and sulphones efficiently in a stereo- and regio-specific manner, while esters of chiral alcohols undergo diastereofacially selective epoxidation.
Synthesis of naturally occurring (2S,3S)-(+)-aziridine-2,3-dicarboxylic acid.
作者:Johan Legters、Lambertus Thijs、Binne Zwanenburg
DOI:10.1016/s0040-4020(01)87140-4
日期:1991.1
followed by treatment with triphenylphosphine in N,N-dimethylformamide. Subsequent hydrolysis with lithium hydroxide and acidification with Dowex 50W-X2 (H+) afforded (2S,3S)-(+)-aziridine-2,3-dicarboxylic acid, which was identical in all respects to the natural product.