attack of TMS-diazomethane was determined to be the first step of the BF3-promoted ring expansion reaction of six-membered ketones using TMS-diazomethane. The migration reaction occurred in a conformation in which the carbonyl oxygen and the TMS group were antiperiplanar to predominantly afford trans-seven-membered ketones.
TMS-
重氮甲烷的赤道侵蚀被确定为使用TMS-
重氮甲烷进行的BF 3促进的六元酮扩环反应的第一步。迁移反应发生在构象中,其中羰基氧和TMS基团是反平面的,主要提供反式七元酮。