Highly regioselective decarboxylative Claisen rearrangement reactions of diallyl 2-sulfonylmalonates
摘要:
The decarboxylative Claisen rearrangement of a range of substituted diallyl 2-sulfonylmalonates is described. The substrates are made by C-carboxylation of the corresponding allyl sulfonylacetates with allyl para-nitrophenyl carbonates. The reactions display a high degree of regioselectivity, with allylic substituents possessing electron-rich substituents at the allyl three-position rearranging preferentially. (C) 2007 Elsevier Ltd. All rights reserved.
A [3,3]-sigmatropic process catalysed by acetate. The decarboxylative Claisen rearrangement
作者:Damien Bourgeois、Donald Craig、Fabienne Grellepois、David M. Mountford、Alan J.W. Stewart
DOI:10.1016/j.tet.2005.09.073
日期:2006.1
Allylic tosylacetates and tosylmalonates undergo acetate-catalysed decarboxylative Claisen rearrangement in the presence of N,O-bis(trimethylsilyl)acetamide. The homoallylic sulfones formed in these transformations correspond to the products of regiospecific allylation of sulfone-stabilised carbanions. A mechanistic rationale is proposed. (c) 2005 Elsevier Ltd. All rights reserved.