作者:Franz Effenberger、Joachim Eichhorn
DOI:10.1016/s0957-4166(96)00528-9
日期:1997.2
The stereoselective syntheses of thienyl and furyl analogues of ephedrine starting from (R)- and (S)-cyanohydrins, respectively, are described. Addition of methyl Grignard to the O-trimethylsilyl protected optically active cyanohydrins (R)- and (S)-3 and hydrogenation of the resulting imino intermediates gives the erythro-2-amino alcohols 4 with high diastereoselectivity. Their reductive methylation
描述了分别从(R)-和(S)-氰醇开始的麻黄碱的噻吩基和呋喃类似物的立体选择性合成。在O-三甲基甲硅烷基保护的旋光性氰醇(R)-和(S)-3上添加甲基格氏试剂,然后将所得的亚氨基中间体氢化,得到具有高非对映选择性的赤型-2-氨基醇4。它们的还原甲基化导致对映体纯的噻吩类似物(1 S,2 S)-和(1R,2R)-6a ,(1 R,2 S)-和(1S,2R)-6b以及呋喃类似物(1S,2S)-6c和(1R,2S)-6d麻黄碱。新化合物的生物活性正在研究中。