Used in combination with the Sharpless asymmetric epoxidation of allylicalcohols, this rearrangement represents a new approach to the synthesis of various opticallyactive β-hydroxy aldehydes, useful intermediates in natural product synthesis. The modified organoaluminum reagent, MABR is also applicable to the transformation of a variety of simple epoxides to carbonyl compounds with high efficiency
characteristic Lewis acid catalyst in the regio- and stereoselective rearrangement of epoxides to aldehydes. This Cr(TPP)OTf-catalyzed reaction is an operationally simple and especially convenient method for synthesizing optically active beta-siloxy aldehydes from 2,3-epoxy silyl ethers which are readily available in enantiomerically enriched forms by the Sharpless epoxidation of allylic alcohols followed
Organoaluminum-promoted rearrangement of epoxy silyl ethers to .beta.-siloxy aldehydes
作者:Keiji Maruoka、Takashi Ooi、Hisashi Yamamoto
DOI:10.1021/ja00198a070
日期:1989.8
Metallophthalocyanine complex, Cr(TBPC)OTf: an efficient, recyclable Lewis acid catalyst in the regio- and stereoselective rearrangement of epoxides to aldehydes
The metallophthalocyanine complex Cr(TBPC)OTf works as a highly efficient, recyclable Lewisacidcatalyst for the regio- and stereoselective rearrangements of epoxides to aldehydes.