Studies towards the total synthesis of rapamycin: Preparation of the cyclohexyl C33C42 fragment and further coupling to afford the C22C42 carbon unit
作者:Cyrille Kouklovsky、Steven V. Ley、Stephen P. Marsden
DOI:10.1016/s0040-4039(00)73058-9
日期:1994.3
A short and stereoselective synthesis of the C33C42 fragment 3 of rapamycin and its coupling with the previously prepared C22C32 fragment 2 is described. The synthesis of 3 involves the preparation of enantiomerically enriched methylene cyclohexane derivative 7, followed by side-chain elaboration. The coupling is made by reaction of the lithio anion of the dithioacetal monosulfone 11 on the epoxide
描述了雷帕霉素C 33 = C 42片段3的短而立体选择性合成及其与先前制备的C 22 = C 32片段2的偶联。3的合成涉及对映体富集的亚甲基环己烷衍生物7的制备,然后进行侧链修饰。通过二硫缩醛单砜11的锂硫阴离子在环氧化物3上的反应进行偶联。