Synthetic Approaches to Rapamycin: Synthesis of a C10-C26 Fragment via a One-Pot Julia Olefination Reaction
作者:Richard Bellingham、Krzysztof Jarowicki、Philip Kocienski、Valerie Martin
DOI:10.1055/s-1996-4184
日期:1996.2
Key steps in a synthesis of the C10-C26 fragment of the immunosuppressant Rapamycin include (a) the use of a metallated benzothiazolyl sulfone in a one-pot Julia olefination to create the C21-C22 alkene stereoselectively and (b) a diastereoselective acid-catalysed cyclisation of a hydroxyl function onto a ketenedithioacetal (1,4-asymmetric induction) in order to create the oxane ring and fix the stereochemistry at C11.
免疫抑制剂雷帕霉素C10-C26片段合成的关键步骤包括:(a)在一锅法Julia烯化反应中使用金属化的苯并噻唑硫酮以立体选择性地形成C21-C22烯烃;(b)在酮烯二硫缩醛上通过酸催化的立体选择性环化反应引入羟基功能团(1,4-非对称诱导),以形成氧烷环并固定C11的立体化学。