2,3-Disubstituted indoles from olefins and hydrazinesvia tandem hydroformylation–Fischer indole synthesis and skeletal rearrangement
作者:Petra Linnepe (née Köhling)、Axel M. Schmidt、Peter Eilbracht
DOI:10.1039/b513364e
日期:——
synthesis of 2,3-disubstituted indoles. After hydroformylation of selected olefins to form alpha-branched aldehydes in a one-pot procedure these are condensed with phenylhydrazine to give hydrazones. Upon acid-promoted [3,3]-sigmatropic rearrangement indolenine intermediates with quaternary centres in the 3-position are formed, which, after selective Wagner-Meerwein-type rearrangement of one of the