中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
(2s,4r)-1,2-二苄氧羰基-4-羟基吡咯烷 | N-benzyloxycarbonyl-(2S,4R)-4-hydroxyproline benzyl ester | 13500-53-3 | C20H21NO5 | 355.39 |
Hexasubstituted guanidinium moieties have been used as ionic liquid tags for organocatalyts for the first time. Such conjugates were obtained in the (S)-proline and (S)-pyrrolidine-2-ylmethyl series by alkylation reactions of pentasubstituted guanidines. The resulting guanidinium-tagged organocatalysts were applied to asymmetric direct aldol reactions providing high stereoselectivities and yields and good recyclability, and thus performed better than (S)-proline itself