Synthesis of thiophenes from allenyl sulfones involving α,β-unsaturated sulfines as intermediates
作者:Johannes B. van der Linden、Peter F. T. M. van Asten、Samuel Braverman、Binne Zwanenburg
DOI:10.1002/recl.19951140203
日期:——
The synthesis of thiophenes starting fromallenylsulfones, via intermediate formation of α,β-unsaturatedsulfines, is described. The allenylsulfones were synthesized by a [2,3]-sigmatropic rearrangement of appropriately substituted prop-2-ynyl sulfinates. Treatment of the allenylsulfones with n-butyllithium and chlorotrimethylsilane gave α-silylated allenylsulfones in almost quantitative yield