Asymmetric Synthesis of <i>cis</i>- and <i>trans</i>-2,5-Disubstituted Pyrrolidines from 3-Oxo Pyrrolidine 2-Phosphonates: Synthesis of (+)-Preussin and Analogs
作者:Franklin A. Davis、Junyi Zhang、Hui Qiu、Yongzhong Wu
DOI:10.1021/ol800255r
日期:2008.4.1
Pyrrolidine enones, derived from 3-oxo pyrrolidine 2-phosphonates and a HWE reaction with aldehydes, on Luche reduction give pyrrolidine allylic alcohols. The alcohols on hydrogenation (Pd/H2) give cis-2,5-disubstituted pyrrolidines and on treatment with TFA-NaBH3CN undergo a hydroxy directed reduction to trans-2,5-disubstituted pyrrolidines.
由3-氧代吡咯烷2-膦酸酯和与醛的HWE反应衍生的吡咯烷酮烯酮经Luche还原得到吡咯烷烯丙基醇。醇在氢化(Pd / H 2)时产生顺式2,5-二取代的吡咯烷,并且在用TFA-NaBH 3 CN处理时经历羟基定向还原为反式2,5-二取代的吡咯烷。