Reaction of epoxides with activated DMSO reagent. General method for synthesis of α-chlorocarbonyl compounds: Application in asymmetric synthesis of (3S)-2,3-oxidosqualene
作者:Sushil Raina、Vinod K. Singh
DOI:10.1016/0040-4020(94)01111-c
日期:1995.2
Reaction of a variety of epoxides with DMSO-Oxalyl chloride in the presence of a catalytic amount of methanol and a base was studied. Disubstituted epoxides gave α-chloroketones in high yields. Aliphatic terminal epoxide underwent opening reaction to provide α-chloroketone as a major product. Trisubstututed epoxides provided α-chloroketones as major products through the formation of more stable carbocation
研究了在催化量的甲醇和碱存在下,各种环氧化物与DMSO-草酰氯的反应。二取代的环氧化物以高收率得到α-氯酮。脂肪族末端环氧化物进行开环反应,以提供α-氯酮为主要产物。三取代的环氧化物通过形成更稳定的碳正离子而提供α-氯酮作为主要产物。在均丙醇的情况下,获得烯二酮。通过将其应用于(3S)-2,3-氧化角鲨烯的对映选择性合成,表明了该方法的效率。