syn-Selective crotylation of aldehydes using bismuth-crotyl bromide-(1-butyl-3-methylimidazolium bromide) combination: some synthetic applications
作者:Dibakar Goswami、Mrunesh R. Koli、Sucheta Chatterjee、Subrata Chattopadhyay、Anubha Sharma
DOI:10.1039/c7ob00626h
日期:——
The Bi-[bmim][Br] combination has been found to offer high syn-selectivity in the crotylation of aldehydes with crotyl bromide using practically stoichiometric amounts of the reagents. The room temperature ionic liquid (RTIL), [bmim][Br], activated Bi metal in the presence of oxygen to produce crotylbismuthdibromide, which reacted with the aldehydes at room temperature. The major anti–syn diastereomeric
所述双环[BMIM] [BR]组合已被发现提供高顺式-选择性使用几乎化学计量的量的试剂与巴豆基溴醛的crotylation。室温离子液体(RTIL)[bmim] [Br]在氧气存在下活化Bi金属,生成crotylbismuthdibromide,后者在室温下与醛反应。主要的抗-顺式从(的crotylation得到非对映体产物- [R)-cyclohexylideneglyceraldehyde被用于dictyostatin和的cryptophycin段,和(+)的合成-顺-aerangis内酯,使用标准合成方案。