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US09403766B2 Intermediates for producing NEP inhibitors or prodrugs thereof 有权
用于生产NEP抑制剂的中间体或其前药

Intermediates for producing NEP inhibitors or prodrugs thereof
摘要:
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.
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