The present invention provides a compound of formula (IV)
wherein R is Cl, Br, NO2, OH or OR′, and R′ is alkyl, and its use in the synthesis of levocetirizine, including its use in the synthesis of (−)-1-[(4-chlorophenyl)-phenylmethyl]piperazine, an intermediate useful in the synthesis of levocetirizine. The present invention also provides compounds (II) and (III) which are useful in the synthesis of compound (IV).
本发明提供了一种化合物(IV)的公式,其中R是Cl,Br,
NO2,OH或OR',而R'是烷基,以及其在左旋赛替芬的合成中的应用,包括其在左旋赛替芬的合成中的中间体1-[(4-
氯苯基)-苯甲基]
哌嗪的使用。本发明还提供了化合物(II)和(III),它们在化合物(IV)的合成中非常有用。