Stereoselective Synthesis ofEnantiomerically Pure, Orthogonally Protected 2-Methylenecyclohexane-1,3,5-triolsand 2,4,6-Trihydroxycyclohexanones
作者:Thorsten Bach、Stefan Kirsch
DOI:10.1055/s-2003-41025
日期:——
The triply silyl protected 2-methylenecyclohexane-1,3,5-triols 1a-c (C-1: tert-butyldimethylsilyl, TBDMS; C-3:trimethylsilyl, TMS; C-5: tert-butyldiphenylsilyl,TBDPS) were prepared from (R)-(-)-carvonein seven synthetic steps (overall yields: 29-53%).Ozonolysis in the presence of triethylamine yielded the triply protected2,4,6-trihydroxycyclohexanones 2a-c (85%-quant.). The configurationof the products was proven by NOESY studies and by chemical correlation.
三硅保护的2-亚甲基环己烷-1,3,5-三醇1a-c (C-1: 烷基二甲基硅基,TBDMS;C-3: 三甲基硅基,TMS;C-5: 烷基二苯基硅基,TBDPS) 是通过七个合成步骤从(R)-(-)-卡文酮制备而成(总体产率:29-53%)。在三乙胺存在下进行臭氧化反应,获得了三重保护的2,4,6-三羟基环己酮2a-c(量产率85%)。产品的构型通过NOESY研究和化学相关性得到了证实。