163013-14-7Relevant articles and documents
Asymmetric Synthesis of 2H-Azirine 2-Carboxylate Esters
Davis, Franklin A.,Liu, Hu,Liang, Chang-Hsing,Reddy, G. Venkat,Zhang, Yulian,Fang, Tianan,Titus, Donald D.
, p. 8929 - 8935 (2007/10/03)
2H-Azirine 2-carboxylate esters (5), the smallest unsaturated nitrogen heterocycle, are readily prepared in enantiomerically pure form via the base-induced elimination of sulfenic acid (RSOH) from nonracemic N-sulfinylaziridine 2-carboxylate esters (4). Optimum yields were obtained when the aziridine was treated with TMSCl at -95 °C followed by LDA, which was attributed to the improved leaving group ability of an silicon-oxonium species. By using this new methodology the first asymmetric syntheses of the marine cytotoxic antibiotics (R)-(-)- and (S)-(+)-dysidazirine (2) were accomplished.