The present invention relates to a process for the preparation of olopatadine and, more particularly, to an improved method of synthesizing olopatadine which comprises reacting a dibenz[b,e]oxepin-11-one derivative of formula (III) and a suitable reagent under Witting condition, and to the intermediate 11-[(Z)-3-(dimethylamino)-propylidene]-6-11-dihydrodibenz[b,e]-oxepin-2-acet-amide p-toluensulfonate salt.
本发明涉及一种制备奥洛帕替定的方法,更具体地,涉及一种改进的合成奥洛帕替定的方法,包括在Witting条件下反应式(III)的二苯并[b,e]氧杂
环十一酮衍
生物和适当的试剂,以及中间体11-[(Z)-3-(
二甲氨基)-
丙烯基]-6-11-二氢二苯并[b,e]-氧杂环-2-乙酰胺
对甲苯磺酸盐。