Novel process for the preparation of 1-(9h-carbazol-4-yloxy)-3-[[2-(-methoxyphenoxy)-ethyl] amino]-propan-2-ol
申请人:Tarur Radhakrishnan Venkatasubramanian
公开号:US20070191456A1
公开(公告)日:2007-08-16
The present invention discloses a novel process for preparation of carvedilol by using eco friendly solvents to obtain the said carvedilol in high purity. The said process comprises, reacting 4-hydroxy carbazole of formula (IV) with epichlorhydrin in presence of an organic solvent and a base at temperatures between 10° C.-30° C.; further reacting the resultant 4-(2,3-epoxypropoxy)- carbazole of formula (II) with a salt of 2-(2-methoxyphenoxy)ethylamine of formula (III), preferably hydrochloride salt in presence of a base and a hydroxylic solvent at temperatures between 30° C.-90° C.
本发明揭示了一种使用环保溶剂制备卡维地洛的新工艺,以高纯度获得卡维地洛。该工艺包括,在有机溶剂和碱的存在下,将式(IV)的4-羟基咔唑与环氧氯丙烷反应,在10℃-30℃的温度下进行;进一步,在羟基溶剂的存在下,在30℃-90℃的温度下,将式(II)的4-(2,3-环氧丙氧基)-咔唑与式(III)的2-(2-甲氧基苯氧基)乙胺盐,优选为盐酸盐,在碱的存在下反应。