Diastereoselective synthesis of (E)-alkenes and (E)-1,ω-dienes starting from diastereoisomeric mixtures of 1-bromo-1-alkenes: New syntheses of monounsaturated or bridged ring-ketal naturally occurring substances.
Diastereoselective synthesis of (E)-alkenes and (E)-1,ω-dienes starting from diastereoisomeric mixtures of 1-bromo-1-alkenes: New syntheses of monounsaturated or bridged ring-ketal naturally occurring substances.
traditional C −C cross‐coupling reactions they have been rarely used and Pd catalysts usually give a superior performance. Herein we report that in situ formed gold metal nanoparticles are highly active catalysts for the crosscoupling of allylstannanes and activated alkylbromides to form C −C bonds. Turnover numbers up to 29 000 could be achieved in the presence of active carbon as solidsupport, which allowed
Catalytic Asymmetric Allylic and Homoallylic Diamination of Terminal Olefins via Formal C−H Activation
作者:Haifeng Du、Baoguo Zhao、Yian Shi
DOI:10.1021/ja8027394
日期:2008.7.1
This paper describes a catalyticasymmetric diamination process for terminal olefins at allylic and homoallylic carbons via formal C-H activation using di-tert-butyldiaziridinone as nitrogen source with a catalyst generated from Pd2(dba)3 and chiral phosphorus amidite ligand. A wide variety of readily available terminal olefins can be effectively diaminated in good yields with high regio-, diastereo-