Stereoselective synthesis of deoxy analogues of the 3C-protease inhibitor thysanone
作者:Margaret A Brimble、Richard J.R Elliott
DOI:10.1016/s0040-4020(01)01120-6
日期:2002.1
from (R)-epoxide 6 which in turn was obtained via Sharpless asymmetric dihydroxylation of allylnaphthalene 5. An improved asymmetric synthesis of (1S,3R)-(+)-7,9-dideoxythysanone 9 in 72% ee was then accomplished starting from (R)-bromoalcohol 7 which was obtained via asymmetric reduction of ketone 12 using a modified chiral oxazaborolidine. The key ketone 12 in turn was prepared by Wacker oxidation
外消旋7,9-二脱氧胸腺酮9的合成是从烯丙基萘5经由环氧化反应还原为溴代醇7而实现的。随后的溴化锂化,并用DMF淬灭,得到内酯8,该内酯经历了干净的氧化去甲基化为外消旋6,8-二脱氧胸腺酮9。(1个合成[R,3小号(+) - - )-7,9- dideoxythysanone 9然后尽管是在低EE实现,从(起始- [R)-epoxide 6继而经由烯丙基萘的Sharpless不对称二羟基化获得5。(1 S,3 - [R )- (+) - 7,9- dideoxythysanone 9以72%的ee值。然后从完成(开始- [R)-bromoalcohol 7将其通过不对称还原酮得到12使用改性手恶唑硼烷。进而通过烯丙基萘5的Wacker氧化来制备关键酮12。