Rh-Catalyzed AldehydeAldehyde Cross-Aldol Reaction under Base-Free Conditions: In Situ Aldehyde-Derived Enolate Formation through Orthogonal Activation
作者:Luqing Lin、Kumiko Yamamoto、Shigeki Matsunaga、Motomu Kanai
DOI:10.1002/asia.201300928
日期:2013.12
The chemoselective generation of aldehyde‐derived enolates to realize an aldehydealdehyde cross‐aldol reaction is described. A combined Rh/dippf system efficiently promoted the isomerization/aldol sequence by using primary allylic, homoallylic, and bishomoallylic alcohols; secondary allylic and homoallylic alcohols; and trialkoxyboranes that were derived from primary allylic and homoallylic alcohols
描述了实现醛醛交叉醇醛缩合反应的醛基烯醇化物的化学选择性生成。Rh / dippf组合系统通过使用伯烯丙基,均烯丙基和双烯丙基烯丙醇有效地促进了异构化/羟醛序列。仲烯丙基和均烯丙基醇;以及衍生自伯烯丙基和均烯丙基醇的三烷氧基硼烷。该反应在无碱条件下于环境温度下进行,因此得到具有高化学选择性的交叉羟醛产物。还描述了机理研究及其在无保护基团条件下在双羟醛工艺中的应用。