Ir(ppy)<sub>3</sub>-Catalyzed, Visible-Light-Mediated Reaction of α-Chloro Cinnamates with Enol Acetates: An Apparent Halogen Paradox
作者:Thomas Föll、Julia Rehbein、Oliver Reiser
DOI:10.1021/acs.orglett.8b02484
日期:2018.9.21
activation of vinyl chlorides derived from α-chloro ethyl cinnamates via oxidative quenching of excited photocatalyst fac-Ir(ppy)3 is described. Upon photoelectron transfer and chloride extrusion, the corresponding vinyl radical can be efficiently trapped by enol acetates, giving rise to synthetically useful 1,4-dicarbonyl compounds in good to excellent yields. This transformation is distinguished by
描述了由α-氯乙基肉桂酸酯衍生的氯乙烯的可见光介导的活化,该活化是通过激发光催化剂fac -Ir(ppy)3的氧化猝灭。在光电子转移和氯化物挤出时,相应的乙烯基可以被烯醇乙酸酯有效地捕集,从而以良好的至优异的产率产生了合成上有用的1,4-二羰基化合物。这种转化的特征是温和且对环境无害的反应条件,并且可以在数克范围内进行,这与对比的α-溴乙基肉桂酸酯形成鲜明对比,后者在各种条件下均显示出低转化率。