Enantioselective Synthesis of α-Heteroarylpyrrolidines by Copper-Catalyzed 1,3-Dipolar Cycloaddition of α-Silylimines
作者:Ana Pascual-Escudero、María González-Esguevillas、Silvia Padilla、Javier Adrio、Juan C. Carretero
DOI:10.1021/ol5007373
日期:2014.4.18
α-Heteroarylpyrrolidines have been efficiently prepared via 1,3-dipolar cycloaddition between silylimines and activated olefins. In the presence of Cu(CH3CN)4PF6/Walphos as catalytic system, high levels of enantioselectivity (up to ≥99% ee) and diastereoselectivity were achieved (major formation of C-2/C-4 trans-substituted pyrrolidines). The reaction is compatible with a broad variety of dipolarophiles
通过在水飞蓟宾和活化的烯烃之间进行1,3-偶极环加成反应,可以高效地制备α-杂芳基吡咯烷。在存在Cu(CH 3 CN)4 PF 6 / Walphos催化体系的情况下,实现了高水平的对映选择性(高达≥99%ee)和非对映选择性(C-2 / C-4反式吡咯烷的主要形成))。该反应与包括马来酰亚胺,马来酸酯,富马酸酯,硝基烯烃和乙烯基砜在内的多种偶极亲和性相容。所得的环加合物可以转化为生物活性的吡咯烷衍生物。