Immobilization of MacMillan Imidazolidinone as Mac-SILC and its Catalytic Performance on Sustainable Enantioselective Diels-Alder Cycloaddition
作者:Hisahiro Hagiwara、Toshihiro Kuroda、Takashi Hoshi、Toshio Suzuki
DOI:10.1002/adsc.200900865
日期:2010.3.22
(Mac‐SILC) in the pores of silica gel with the aid of an ionic liquid – 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide. The heterogenized organocatalyst was utilized for the enantioselective Diels–Alder reaction of cyclopentadiene and cinnamaldehyde, recovered by simple filtration and subsequent evacuation, and repeatedly used up to six times in 81% average chemical yield, 87% ee for endo‐
麦克米伦的咪唑啉酮催化剂作为负载型离子液体催化剂(Mac‐SILC)借助离子液体– 1-丁基-3-甲基咪唑双(三氟甲基磺酰基)酰亚胺固定在硅胶孔中。所述多相有机催化剂是用于环戊二烯与肉桂醛的对映选择性狄尔斯-阿尔德反应,回收通过简单过滤和随后的抽空,并重复使用多达六次在81%的平均化学产率,87%ee值用于内切-和80%ee值用于exo产品。Mac‐SILC对多种基材均有效。