作者:R. Kluge、M. Schulz、S. Liebsch
DOI:10.1016/0040-4020(95)01128-5
日期:1996.2
have investigated the behaviour of sulfonic peracids 2in situ generated towards olefins 7a,7b,9,11,14,16,18, allylic and homoallylic alcohols 20,22,24,26,28,30,33 and α,β-unsaturated ketones 35,37,39. Generally, the epoxidation proceeds in a peracid-like manner with greater diastereoselectivity than those by common oxidants. In particular, the epoxidation of Δ4 3-ketosteroids 39a-i led to 4α,5α-epoxides
我们已经调查磺酸过酸的行为2原位朝向烯烃产生的图7A,7B,9,11,14,16,18,烯丙基和高烯丙基醇20,22,24,26,28,30,33和α,β-不饱和酮35,37,39。通常,环氧化以类似过酸的方式进行,其非对映选择性高于普通氧化剂。特别是,环氧化Δ 4 3-酮类固醇39A-I导致4α,5α环氧化物40A-i的具有显着的高解值。在胆固醇28b的环氧化中也发现了增强的α-选择性。由于反应条件温和,甚至对酸敏感的环氧化物以良好的产率获得了8a,8b,10,12,13,15,17,19。