First asymmetric synthesis of the Kelatorphan-like enkephalinase inhibitor (1S,2R,2′S[hair space])-2-[2′-(N-hydroxycarbamoylmethyl)-3′-phenylpropionylamino]cyclohexane-1-carboxylic acid

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Stephen G. Davies and Darren J. Dixon


Abstract

The first asymmetric synthesis of Kelatorphan-like enkephalinase inhibitor (1S,2R,2′S[hair space])-2-[2′-(N-hydroxycarbamoylmethyl)-3′-phenylpropionylamino]cyclohexane-1-carboxylic acid is achieved using lithium amide (R)-5 and pyrrolidinone auxiliary (R)-6; the pyrrolidinone auxiliary is used to create (2S[hair space])-benzylsuccinic acid derivative (S[hair space])-4 while lithium amide (R)-5 is used to synthesize tert-butyl (1S,2R)-2-aminocyclohexanecarboxylate 3.


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