Ethyl Acetate → 1-Cyclopentyl 1-{[3-(bromomethyl)benzyl]amino}cyclopentanecarboxylate

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Reaction Steps

To a solution of 3-(bromomethyl)-benzaldehyde (0.467 g, 2.44 mmol) in dichloroethane (20 mL) was added cycloleucine cyclopentyl ester (0.802 g, 4.06 mmol) and sodium triacetoxyborohydride (1.18 g, 5.56 mmol). The mixture was stirred at room temperature for 3 hours, then poured into ethyl acetate (200 mL) and washed with saturated ammonium chloride solution (3 times 50 mL). The organic fraction was dried (MgSO4), concentrated and purified by flash column chromatography (SiO2, 7:3 heptane:ethyl acetate) to yield the desired product (0.568 g, 61% yield). LC/MS: m/z 380/382 [M+H]+

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