(S)-3-(4-Phenyl-1-piperazinyl)-1,2-propanediol cyclic acetals useful as antitussive agents and as intermediates for the preparation of levodropropizine and the salts thereof, as well as a process for the preparation of said acetals, are disclosed.
本发明公开了一种作为镇咳剂和左
氨氯地平及其盐的制备中间体有用的(S)-3-(4-苯基-1-
哌嗪基)-1,2-
丙二醇环状
缩醛,以及制备上述
缩醛的方法。