Ethyl 2-cyano-3-phenylpropanoate → Ethyl 3-amino-2-benzylpropanoate

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The resulting ethyl benzylcyanoacetate was dissolved in 200 ml of EtOH and hydrogenated over Raney nickel. After removal of the catalyst by filtration with suction and concentration, 8.2 . . . of oil were obtained, and chromatography over silica gel (EA to EA/MeOH 5/1) gave 5.5 g of ethyl 3-amino-2-benzylpropionate. This compound was reacted with Boc2O to give ethyl 2-benzyl-3-(tert.-butoxycarbonylamino)-propionate, which was hydrolyzed, and the product was coupled with H-Val-OMe by the PPA method. The resulting diastereomers were resolved by chromatography (toluene/diisopropyl ether 1/1).

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