WO-2018001353, APREMILAST, NEW PATENT, ZHEJIANG HUAHAI PHARMACEUTICAL CO., LTD
WO-2018001353, APREMILAST, NEW PATENT, ZHEJIANG HUAHAI PHARMACEUTICAL CO., LTD (WO2018001353) METHOD FOR PREPARING APREMILAST ZHEJIANG HUAHAI PHARMACEUTICAL CO., LTD DU, Xiaoqiu; (CN). ZHOU, Lianchao; (CN). LIU, Jiegen; (CN) https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2018001353&recNum=1&maxRec=&office=&prevFilter=&sortOption=&queryString=&tab=FullText EN)Method one: (S) -1- (3-ethoxy-4-methoxyphenyl) -2- (methylsulfonyl) ethylamine N-acetyl-L-leucine salt of formula II is reacted with 3-acetylaminophthalic anhydride of formula III in an aprotic solvent to …