Insertions of silylenes into the allylic carbon–oxygen bond of vinyl epoxides was shown to generate 1,2-silaoxetanes. These intermediates undergo highly diastereoselective additions to aldehydes to form anti-Bredt olefins and trans-dioxasilacyclooctenes. Additions of electrophiles could be performed selectively on the outside face of these strained trans-cycloalkenes to provide valuable functionalized compounds.
将
硅烯插入
乙烯环氧化物的烯丙基碳-氧键生成1,2-
硅氧烷。这些中间体经过高度非对映选择性的反应与醛发生加成,形成反-Bredt烯和反-二氧
硅烷环
辛烯。对这些受到张力的反环
烷烃的外侧面选择性地进行亲电试剂的加成,可以得到有价值的功能化化合物。