Studies on electrophilic reaction of Br2 with 1,2-allenylic sulfones. A highly regio- and stereoselective synthesis of 1-phenylsulfonyl-2-bromo-1(E)-alken-3-ols and 1-phenylsulfonyl-2-bromo-1(E),3(E)-butadienes
摘要:
The reaction of 1,2-allenyl sulfones with Br-2 afforded E-bromohydroxylation- or E-bromination-elimination products highly regio-and stereoselectively depending on the substitution pattern of the allene functionality. The five-membered intermediate cis-3h was isolated and characterized by X-ray diffraction study. The study on its reactivity of this intermediate revealed the origin of the regio-and stereoselectivity of this reaction. (C) 2007 Published by Elsevier Ltd.
Observation of the First Heck-Type Cross-Coupling Reaction of Allenes with Aryl Halides. Synthesis of Polysubstituted 1,2-Allenyl Sulfones
作者:Chunling Fu、Shengming Ma
DOI:10.1021/ol050301j
日期:2005.4.14
[reaction: see text] The Heck-type allenylation of aryl halides with allenes has been observed for the first time: The regioselectivity of intermolecular carbopalladation of 1,2-allenyl sulfones affording vinylic Pd intermediates is completely opposite to what was reported in the literature.