Hydrogen Borrowing Catalysis with Secondary Alcohols: A New Route for the Generation of β-Branched Carbonyl Compounds
作者:Wasim M. Akhtar、Choon Boon Cheong、James R. Frost、Kirsten E. Christensen、Neil G. Stevenson、Timothy J. Donohoe
DOI:10.1021/jacs.6b12840
日期:2017.2.22
hydrogen borrowing reaction employing secondary alcohols and Ph* (Me5C6) ketones to give β-branched carbonyl products is described (21 examples). This new C-C bond forming process requires low loadings of [Cp*IrCl2]2, relatively low temperatures, and up to 2.0 equiv of the secondary alcohol. Substrate-induced diastereoselectivity was observed, and this represents the first example of a diastereoselective
描述了使用仲醇和 Ph* (Me5C6) 酮产生 β-支化羰基产物的借氢反应(21 个实施例)。这种新的 CC 键形成过程需要低负载量的 [Cp*IrCl2]2、相对较低的温度和高达 2.0 当量的仲醇。观察到底物诱导的非对映选择性,这代表了非对映选择性烯醇化物借氢烷基化的第一个例子。通过利用 Ph* 基团,β-支化产物可以使用逆弗里德尔-克拉夫茨反应直接裂解为相应的酯或酰胺。最后, 该协议应用于合成香料化合物 (±)-3-甲基-5-苯基戊醇。