An Efficient Method for Cyclopentene Annulation onto α,β-Unsaturated Ketones: W(CO)<sub>5</sub>(L)-Catalyzed 5-Endo-Dig Cyclization of 6-Siloxy-5-en-1-ynes
作者:Nobuharu Iwasawa、Tomoya Miura、Koichi Kiyota、Hiroyuki Kusama、Kooyeon Lee、Phil Ho Lee
DOI:10.1021/ol026993i
日期:2002.12.1
[reaction: see text] A highly efficient method for the cyclopentene annulation onto alpha,beta-unsaturated ketones is described. Indium-mediated 1,4-propargylation onto alpha,beta-unsaturated ketones in the presence of tert-butyldimethylsilyl triflate and dimethyl sulfide gives the 6-siloxy-5-en-1-yne derivatives, which undergo W(CO)(5)(L)-catalyzed 5-endo-dig cyclization to give the corresponding
[反应:见正文]描述了一种高效的环戊烯环化成α,β-不饱和酮的方法。在叔丁基二甲基甲硅烷基三氟甲磺酸盐和二甲基硫醚存在下,铟介导的1,4-炔丙基化成α,β-不饱和酮,得到6-甲硅烷氧基-5-en-1-炔衍生物,其经历W(CO)(5) (L)催化的5-endo-dig环化反应以良好的产率得到相应的环戊烯衍生物。