Benzyl chloroformate → 1,3,4,9-Tetrahydro-beta-carboline-2-carboxylic acid benzyl ester

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Reaction Steps

Benzyl chloroformate (1.8 ml, 12.6 mmol) was added to a solution of 1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indole (1.72 g, 10.0 mmol) and sodium bicarbonate (1.85 g, 22.0 mmol) in dioxan (50 ml) at room temperature. The mixture was stirred at room temperature for 16 hours, concentrated in vacuo and the residue dissolved in water (50 ml). The aqueous mixture was extracted with chloroform (3×50 ml), and the combined extracts dried (MgSO4). Filtration and evaporation of the solvent gave the crude product which was purified by chromatography on silica gel with hexane-ethyl acetate (3:2) as eluant. (3.07 g, 100%).

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