Silver(<scp>i</scp>)-mediated highly enantioselective synthesis of axially chiral allenes under thermal and microwave-assisted conditions
作者:Vanessa Kar-Yan Lo、Cong-Ying Zhou、Man-Kin Wong、Chi-Ming Che
DOI:10.1039/b914516h
日期:——
Silver(I) salts mediated stereospecifictransformation of opticallyactive propargylamines to axially chiral allenes with excellent enantioselectivities (17 examples with 96-99% ee; one substrate with 91% ee) without subsequent racemization.
Gold-Catalyzed Highly Enantioselective Synthesis of Axially Chiral Allenes
作者:Vanessa Kar-Yan Lo、Man-Kin Wong、Chi-Ming Che
DOI:10.1021/ol702970r
日期:2008.2.1
Axiallychiral allenes are synthesized from chiral propargylamines catalyzed by KAuCl4 in high yields (up to 93% yield) and excellent enantioselectivities (up to 97% ee) in CH3CN at 40 degrees C. The reaction has been applied to the synthesis of novel allene-modified artemisinin derivatives with the delicate endoperoxide moieties remaining intact. A tentative mechanism regarding gold(I)-catalyzed intramolecular