Phenethylamine → (2S,3R)-3-(3-Phenethylamino-propyl)-1-((S)-1-phenyl-ethyl)-pyrrolidine-2-carboxylic acid ethyl ester

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Reaction Steps

To a solution of (2S,3R)-1-((2E,4Z)—(S)-1,2-Dimethyl-hexa-2,4-dienyl)-3-(3-oxo-propyl)pyrrolidine-2-carboxylic acid ethyl ester (1 g, crude) in EtOH (10 mL) is added phenethylamine (0.44 g, 3.65 mmol) at r.t. After stirring at r.t. for 30 min, NaBH3CN (0.3 g, 4.87 mmol) is added in one portion, After stirring at r.t. for 1.5 Hrs, the reaction solution is diluted with 50 mL of ether and washed with 20 mL of brine. The ether layer is concentrated and the crude product is purified by chromatography (CH2Cl2/MeOH: 97/3) to give a pale liquid (405 mg, 30.0%). (NMR and MS data confirmed, U-4117-52-20).

Provenance & Evidence