Chloroacetyl chloride → Methyl 1-(Chloroacetyl)-4-(4-methoxybenzenesulfonyl)-2,3,4,5-tetrahydro-1H-[1,4]benzodiazepine-3-carboxylate

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Reaction Conditions

Reaction Steps

To a mixture of 2.5 g (6.64 mmol) of methyl 4-(4-methoxybenzenesulfonyl)-2,3,4,5-tetrahydro-1H-[1,4]benzodiazepine-3-carboxylate (Reference Example 12) and 4.63 ml (33.2 mmol) of triethylamine in 40 ml of CH9Cl2 cooled to 0° C. was added to 1.65 g (14.63 mmol) of chloroacetyl chloride. The solution was stirred at room temperature for 2 days, chilled to 0° C. and 926 μl of triethylamine and 750 mg of chloroacetyl chloride were added thereto. The mixture was stirred at room temperature overnight, diluted with CH2Cl2 and H2O. The insoluble solid was filtered off. The organic layer of the filtrate was separated, washed with brine, dried with Na2SO4 and filtered through diatomaceous earth. The solvent was removed and the residue triturated with ethyl acetate and a trace of ethanol. Chilling and filtering gave 0.75 g of methyl 1-(chloroacetyl)-4-(4-methoxybenzenesulfonyl)-2,3,4,5-tetrahydro-1H-[1,4]benzo-diazepine-3-carboxylate (Reference Example 91). Anal. for C20H21ClN2O6S: Calc'd: C,53.0; H,4.7; N,6.2; Found: C,51.6; H,4.6; N,5.7; Mass Spectrum (ES): 453.0 (M+H).

Provenance & Evidence