Conversion of Aldehydes to Branched or Linear Ketones via Regiodivergent Rhodium-Catalyzed Vinyl Bromide Reductive Coupling–Redox Isomerization Mediated by Formate
作者:Robert A. Swyka、William G. Shuler、Brian J. Spinello、Wandi Zhang、Chunling Lan、Michael J. Krische
DOI:10.1021/jacs.9b03113
日期:2019.5.1
coupling-redox isomerization to form branched ketones. Use of the less strongly coordinating ligand, PPh3, promotes vinyl- to allylrhodium isomerization en route to linear ketones. This method bypasses the 3-step sequence often used to convert aldehydes to ketones involving the addition of pre-metalated reagents to Weinreb or morpholine amides.
描述了一种用于将醛直接转化为支链或直链烷基酮的区域发散催化方法。P tBu2Me 修饰的铑配合物催化甲酸盐介导的醛-溴乙烯还原偶联-氧化还原异构化,形成支链酮。使用不太强的配位配体 PPh3 可促进乙烯基到烯丙基铑的异构化,从而生成线性酮。这种方法绕过了通常用于将醛转化为酮的 3 步序列,包括将预金属化试剂添加到 Weinreb 或吗啉酰胺。