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。