Lewis Acid Induced Tandem Diels−Alder Reaction/Ring Expansion as an Equivalent of a [4 + 3] Cycloaddition
作者:Huw M. L. Davies、Xing Dai
DOI:10.1021/ja039908q
日期:2004.3.1
Aluminum chloride induced reaction between cyclopentadiene and alpha,beta-unsaturated aldehydes results in the stereoselective formation of the products of a formal [4 + 3] cycloaddition. The reaction proceeds by a tandemDiels-Alderreaction/ring expansion.
Highly selective γ-alkylation of triisopropylsilylallyl anion. Synthesis of α-triisopropylsilyl aldehydes.
作者:Joseph M. Muchowski、Reto Naef、Michael L. Maddox
DOI:10.1016/s0040-4039(00)98211-x
日期:1985.1
The reaction of triisopropylsilylallyllithium with alkyl halides took place with considerably greater γ-selectivity than reported for trimethylsilyl allyllithium. Silica gel induced rearrangement of the epoxides 5 derived from the alkylation products 3 gave α-triisopropylsilyl aldehydes 6 by a process in which silyl group transposition occurred with predominant inversion at the migration terminus.