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
Gold(III) (C^N) complex-catalyzed synthesis of propargylamines via a three-component coupling reaction of aldehydes, amines and alkynes
作者:Vanessa Kar-Yan Lo、Karen Ka-Yan Kung、Man-Kin Wong、Chi-Ming Che
DOI:10.1016/j.jorganchem.2008.12.008
日期:2009.2
via a gold(III) (C^N) complex-catalyzed three-componentcouplingreaction of aldehydes, amines and alkynes in water at 40 °C. Excellent diastereoselectivities (up to 99:1) have been achieved when chiral prolinol derivatives are employed as the amine component. Notably, the [Au(C^N)Cl2] complex (N^CH = 2-phenylpyridine) could be repeatedly used for 10 reaction cycles, leading to an overall turnover number