作者:Franklin A. Davis、Hu Liu、Chang-Hsing Liang、G. Venkat Reddy、Yulian Zhang、Tianan Fang、Donald D. Titus
DOI:10.1021/jo991389f
日期:1999.11.1
sulfenic acid (RSOH) from nonracemic N-sulfinylaziridine 2-carboxylate esters (4). Optimum yields were obtained when the aziridine was treated with TMSCl at -95 degrees 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
最小的不饱和氮杂环2H-Azirine 2-羧酸酯(5)可通过从非外消旋N-亚磺酰基氮丙啶2-羧酸酯(4)中碱诱导的亚磺酸(RSOH)的消除,轻松制备成对映体纯形式。当在-95℃下用TMCSI随后用LDA对氮丙啶进行处理时,可获得最佳产率,这归因于硅-氧鎓物种的离去基团能力提高。通过使用这种新方法,完成了海洋细胞毒性抗生素(R)-(-)-和(S)-(+)-dysidazirine(2)的第一个不对称合成。