This invention relates to an improved process for preparing a valsartan, or a pharmaceutically acceptable salt thereof, or pharmaceutical preparation containing either entity wherein a compound of formula (II)
or a salt thereof, is reacted with valine or an ester or a salt thereof in a solvent selected from the group consisting of methylene chloride, chloroform, butyl chloride, isopropyl acetate and tert-butyl methyl ether to form a compound of formula (IV)
which is then acylated to form a compound of formula (VI)
wherein R is hydrogen, alkyl, alkenyl or benzyl; which is then deprotected to give valsartan, and may be converted to a pharmaceutically acceptable salt and/or a pharmaceutical formulation. The invention also covers intermediates of formula (IV) and (VI) wherein R=H.
这项发明涉及一种改进的制备
缬沙坦、其药用可接受盐或含有任一实体的制药制剂的过程,其中式(II)的化合物或其盐在
甲烷氯化物、
氯仿、丁基
氯化物、
丙酸异丙酯和
叔丁基甲基醚等溶剂中与缬
氨酸或其酯或盐反应,形成式(IV)的化合物,然后酰化形成式(VI)的化合物,其中R为氢、烷基、烯基或苄基;然后去保护得到
缬沙坦,并可转化为药用可接受的盐和/或制药配方。该发明还涵盖了中间体式(IV)和(VI),其中R=H。