Efficient Generation of<i>ortho</i>-Naphthoquinone Methides from 1,4-Epoxy-1,4-dihydronaphthalenes and Their Annulation with Allyl Silanes
作者:Yoshinari Sawama、Yuko Shishido、Takayoshi Yanase、Koichi Kawamoto、Ryota Goto、Yasunari Monguchi、Yasuyuki Kita、Hironao Sajiki
DOI:10.1002/anie.201207315
日期:2013.1.28
dihydronaphthopyran derivatives were obtained in good yield by the regio‐ and stereoselective annulation of ortho‐naphthoquinone methides with allyl silanes. The ortho‐naphthoquinone methides were generated in situ from 1‐siloxymethyl‐1,4‐epoxy‐1,4‐dihydronaphthalenes under FeCl3 catalysis (see scheme; allyl‐TMS=allyltrimethylsilane, TBS=tert‐butyldimethylsilyl, TMS=trimethylsilyl).
通过邻-萘醌甲基化物与烯丙基硅烷的区域和立体选择性环化,可得到高收率的药学上有用的二氢萘并吡喃衍生物。的邻位从原位产生-naphthoquinone甲基化物1-甲硅烷氧基-1,4-环氧-1,4-二氢萘下的FeCl 3催化(参见方案;烯丙基TMS =烯丙基三甲基硅烷,TBS =叔丁基二,TMS =三甲基甲硅烷)。