The invention relates to a new process for producing NEP inhibitors or prodrugs thereof, in particular NEP inhibitors comprising a γ-amino-δ-biphenyl-α-methylalkanoic acid, or acid ester, backbone. In detail, the new processes, according to the present invention, are ultimately related to the synthesis of intermediates to prepare the above NEP inhibitors, namely compounds according to formula (1), or salt thereof,
wherein R1 and R2 are, independently of each other, hydrogen or a nitrogen protecting group, and R3 is a carboxyl group or an ester group, preferably carboxyl group or alkyl ester.
本发明涉及一种生产
NEP抑制剂或其前药的新工艺,特别是包括γ-
氨基-δ-
联苯基-α-甲基
脂肪酸或酸酯骨架的
NEP抑制剂。具体而言,根据本发明,新工艺最终与合成中间体有关,以制备上述
NEP抑制剂,即化合物公式(1)或其盐,其中R1和R2独立地为氢或氮保护基,R3为羧基或酯基,优选为羧基或烷基酯。