Mechanistic Dichotomy with Alkynes in the Formal Hydrohydrazination/Fischer Indolization Tandem Reaction Catalyzed by a Ph3PAuNTf2/pTSA Binary System
作者:Nitin T. Patil、Ashok Konala
DOI:10.1002/ejoc.201001114
日期:2010.12
method involving a formalhydrohydrazination/ Fischerindolizationtandemreaction to synthesize 2,3-disubstituted indoles from alkynes and arylhydrazines has been developed. The approach uses a Ph 3 PAuNTf 2 /pTSA·H 2O binary catalytic system in which a very low catalyst loading of Ph 3 PAuNTf 2 (2 mol-%) is required. The reaction time is very short and, most importantly, the reaction is not sensitive
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