The Rearrangement of 2,3-Epoxysulfonates and Its Application to Natural Products Syntheses: Formal Synthesis of (−)-Aphanorphine and Total Syntheses of (−)-α-Herbertenol and (−)-Herbertenediol
作者:Yasuyuki Kita、Junko Futamura、Yusuke Ohba、Yoshinari Sawama、Jnaneshwara K. Ganesh、Hiromichi Fujioka
DOI:10.1021/jo034573g
日期:2003.7.1
The Lewis acid treatment of 2,3-epoxysulfonates with 2,3-dialkyl substituents or 2-alkyl-3-aryl substituents produced the rearrangement products via C3-cleavage of the oxirane ring in high yields. On the other hand, 2-aryl-3-alkyl-2,3-epoxysulfonates produced the products via C2-cleavage of the oxirane ring. The sulfonyloxy groups of the alpha-sulfonyloxy ketones, having a chiral benzylic quaternary
用2,3-二烷基取代基或2-烷基-3-芳基取代基的2,3-环氧磺酸盐的路易斯酸处理通过环氧乙烷环的C 3裂解以高产率产生重排产物。另一方面,2-芳基-3-烷基-2,3-环氧磺酸盐通过环氧乙烷环的C 2裂解产生产物。通过将2-烷基-3-芳基-2,3-环氧磺酸酯重排而获得的具有手性苄基季碳中心的α-磺酰氧基酮的磺酰氧基被还原消除,得到具有手性苄基季碳中心的酮。该方法适用于(-)-甲啡肽的形式合成以及(-)-α-香叶醇和(-)-香叶二醇的全部合成。