Stereoselective Synthesis of Erythro β-Substituted Aspartates
摘要:
The nucleophilic ring opening of trans-aziridine-2,3-dicarboxylate 1 and substituted N-acyl-, N-(methoxycarbonyl)-, and N-(methanesulfonyl)aziridine-2,3-dicarboxylates 2-4 allows an easy synthetic approach to beta-hydroxy, beta-amino, beta-(alkylthio), and beta-halogenoaspartates 5-8; in this respect, compounds 2-4 display higher reactivities. The erythro stereochemistry of the synthesized aspartates and the S(N)2-like mechanism of the nucleophilic attack were unambiguously identified by the (2R,3S) X-ray absolute configuration determination of enantiomerically pure beta-amino derivative 9, obtained from (2R,3R)-4, and by its chemical correlation with meso alpha,beta-bis[N-(methanesulfonyl)amino]succinate (10).
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.
pure trans-aziridine-2,3-dicarboxylates for which an optimized synthetic pathway is presented. The first example of an enantiomerically pure mixed diester of the aziridine-2,3-dicarboxylic acid the synthesis of the allyl ethyl ester is reported herein.
the corresponding aziridine but diphenyl-N-2-cyano or N-2-phenylsulfonylethylsulfimide, a simple Michaeladduct When optically active (+)-(R)-o-methoxyphenyiphenyl free sulfimide was treated with such an α,β-unsaturated carbonyl compound as benzalacetopbenone, an optically active 2-acylazindine, i.e., (-)-trans-2-benzoyl-3-phenylaziridine was obtained in ca 30% optical purity and its absolute configuration
An Unexpected Carbon Dioxide Insertion in the Reaction of Trans-2,4-Disubstituted Azetidine, Trans-2,5-Disubstituted Pyrrolidine, or Trans-2,6-Disubstituted Piperidine with Diphenylthiophosphinic Chloride and Diphenylselenophosphinic Chloride
作者:Min Shi、Jian-Kang Jiang、Yu-Mei Shen、Yan-Shu Feng、Gui-Xin Lei
DOI:10.1021/jo991985+
日期:2000.6.1
In the reaction of trans-2,4-disubstituted azetidine, trans-2, 5-disubstituted pyrrolidine, or trans-2,6-disubstituted piperidine with diphenylthiophosphinic chloride or diphenylselenophosphinic chloride in acetonitrile in the presence of potassium carbonate at room temperature, an unexpected carbon dioxide insertion produced carbamic diphenylthiophosphinic or diphenylselenophosphinic anhydride in