申请人:IPCA Laboratories Limited
公开号:EP1714963A1
公开(公告)日:2006-10-25
The present invention concerns a process for preparing valsartan of Formula I:
comprising purifying intermediate benzyl valsartan of Formula IV by crystallizing said benzyl valsartan of lower purity from a first solvent which is a ternary mixture comprising a hydrophilic solvent, a non-polar protic solvent and water; recovering benzyl valsartan from said ternary mixture followed by crystallizing benzyl valsartan from a second solvent comprising a non-polar aprotic solvent or polar aprotic solvent or their mixture; and recovering benzyl valsartan substantially free of organotin impurity; and converting said benzyl valsartan of into valsartan
本发明涉及一种制备化合物I的缬沙坦的方法:包括通过结晶从包含亲水溶剂、非极性质子溶剂和水的三元混合物中提纯较低纯度的苄基缬沙坦的中间体苄基缬沙坦的公式IV;从该三元混合物中回收苄基缬沙坦,然后通过从包含非极性脱质子溶剂或极性脱质子溶剂或它们的混合物的第二溶剂中结晶苄基缬沙坦;回收基本无有机锡杂质的苄基缬沙坦;并将所述的苄基缬沙坦转化为缬沙坦。