Regioselective allylation of 2,4- and 4,4-diethoxycyclobutenones was performed with allylsilanes in the presence of BF3•Et2O via a common ethoxycarbenium ion intermediate. A merit of this reaction was demonstrated in an efficient conversion of the obtained 4-allyl-4-ethoxycyclobutenones to bi- and tricycloalkanones.
通过使用
BF3•Et2O,在常见的乙氧基碳正离子中,采用烯丙基
硅烷对2,4-和4,4-二乙氧基
环丁酮进行区域选择性烯丙基化。这一反应的一个优点是在有效转化得到的4-烯丙基-4-乙氧基
环丁酮为双环和三
环醇酮中得到了体现。