Applications of remote stereocontrol using allylstannanes: an approach to the stereoselective synthesis of aliphatic polyols
作者:Alan H. McNeill、Eric J. Thomas
DOI:10.1016/j.tet.2010.10.045
日期:2011.1
7-dienyl(tributyl)stannane was transmetalated by tin(IV) chloride to generate an allyltin trichloride, which reacted with aldehydes to give (3Z)-1,5-syn-5-benzyloxynona-3,8-dien-1-ols with useful 1,5-stereocontrol. O-Benzylation, hydroboration and oxidation of the terminal double-bond of the product from 2-methylpropanal gave (5R,9S,6Z)-5,9-dibenzyloxy-10-methylundec-6-enal. Further reactions with 4
(4 R,2 E)-4-苄氧基-辛基-2,7-二烯基(三丁基)锡烷经氯化锡(IV)进行金属转移生成烯丙基三氯化物,该三氯化烯丙基锡与醛反应生成(3 Z)-1,具有有用的1,5-立体控制的5- syn -5-苄氧基壬娜3,8-二烯-1-醇。来自2-甲基丙醛的产物的末端双键的O-苄基化,硼氢化和氧化得到(5 R,9S,6 Z)-5,9-二苄氧基-10-甲基十一烷基-6-烯醛。与4-烷氧基烷-2-烯基锡烷的进一步反应在有用的1,5-立体控制下进行,得到带有羟基或苄氧基取代基的立体选择性地排列在沿链的远端位置的开链产物。