Stereoselective synthesis of thienyl and furyl analogues of ephedrine
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