Pd(II)-Catalyzed cyclogeneration of carbocations: subsequent rearrangement and trapping under oxidative conditions
作者:Jeong Hwan Koh、Cheryl Mascarenhas、Michel R. Gagné
DOI:10.1016/j.tet.2004.06.023
日期:2004.8
A catalytic oxidative polycyclization reaction initiated by the carbocyclization of 1,5-dienes with Pd(II) is reported. Trapping of a putative carbocation with suitable functional groups (phenols, alkenes, alcohols, sulfonamide), or rearrangement protocols (Pinacol) yields poly-cyclic products in good yields and in excellent diastereoselectivities. Turnover of the intermediate Pd–C bond is via β-H
据报道,由1,5-二烯与Pd(II)的碳环化引发的催化氧化多环化反应。用合适的官能团(苯酚,烯烃,醇,磺酰胺)或重排方案(Pinacol)捕获假定的碳阳离子可得到高收率和出色的非对映选择性的多环产物。中间Pd–C键的周转是通过β-H消除。