Hydrogen-Mediated C−C Bond Formation: Catalytic Regio- and Stereoselective Reductive Condensation of α-Keto Aldehydes and 1,3-Enynes
作者:Hye-Young Jang、Ryan R. Huddleston、Michael J. Krische
DOI:10.1021/ja0316566
日期:2004.4.1
Hydrogenation of 1,3-enynes in the presence of alpha-keto aldehydes using cationic Rh(I) catalysts enables regio- and stereoselective reductive coupling to the acetylenic terminus of the enyne to afford (E)-2-hydroxy-3,5-dien-1-one products. Reductive condensation of 1-phenyl but-3-en-1-yne 1a with phenyl glyoxal 2a performed under an atmosphere of D(2) provides the product of mono-deuteration, (E
使用阳离子 Rh(I) 催化剂在 α-酮醛存在下氢化 1,3-烯炔使区域和立体选择性还原偶联到烯炔的炔末端,得到 (E)-2-羟基-3,5- dien-1-one 产品。在 D(2) 气氛下进行的 1-苯基but-3-en-1-yne 1a 与苯基乙二醛 2a 的还原缩合提供单氘代产物 (E)-2-hydroxy-3-deuterio-3 ,5-dien-1-one deuterio-3a,产率为 85%。涉及在等摩尔量的 1,4-二苯基丁二烯和 1,4-二苯基丁-3-en-1-yne 10a 以及 1,4-二苯基丁-3-en-1 存在下催化氢化苯基乙二醛的竞争实验-yne 10a 和 1,4-二苯基丁二炔,对于与更高不饱和伙伴的偶联具有化学选择性,