Silylcyclopropanes by Selective [1,4]-Wittig Rearrangement of 4-Silyl-5,6-dihydropyrans
作者:Luis M. Mori-Quiroz、Emmanuel W. Maloba、Robert E. Maleczka
DOI:10.1021/acs.orglett.1c01838
日期:2021.8.6
selective [1,4]-Wittig rearrangements to give silylcyclopropanes in good yields. The selectivity is independent of the silyl group, but it is influenced by the electronic character of the migrating center. Electron-rich and electron-neutral (hetero)aryl groups and aliphatic substituents at the migrating center lead to exclusive [1,4]-migration, whereas electron-deficient aryl groups predominantly afford
4-Silyl-5,6-dihydropyrans 发生显着选择性的 [1,4]-Wittig 重排,以良好的产率得到甲硅烷基环丙烷。选择性与甲硅烷基无关,但受迁移中心的电子特性影响。迁移中心的富电子和电子中性(杂)芳基和脂肪族取代基导致排他性的 [1,4]-迁移,而缺电子的芳基主要提供 [1,2]-Wittig 产物。