pyrrolidine-based organocatalysts with a bulky substituent at C2 were synthesized from chiral imines derived from (R)-glyceraldehyde acetonide by diastereoselective allylation followed by a sequential hydrozirconation/iodination reaction. The new compounds were found to be effective organocatalysts for the Michael addition of aldehydes to nitroolefins and enantioselectivities up to 85% ee were achieved
通过衍生自非对映选择性烯丙基化,随后进行顺序的加氢
锆化/
碘化反应,由(R)-
甘油醛
丙酮化物衍生的手性
亚胺合成了在C2具有较大取代基的新型
吡咯烷基有机催化剂。发现新化合物是醛向硝基烯烃的迈克尔加成反应的有效有机催化剂,对映选择性高达85%ee。