Dimethyl Sulfoxide → 1-formylmethyl-5-{4-[2-(4-methylphenyl)benzoylamino]benzoyl}-1,3,4,5-tetrahydro-1,5-benzodiazepin-2(2H)-one

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Reaction Steps

To a solution of oxalyl chloride (0.134 ml) in dichloromethane (10 ml) was added dimethyl sulfoxide (0.109 ml) at -78° C. and the mixture was stirred at the same temperature. After 10 minutes, 1-(2-hydroxyethyl) -5-{4-[2-(4-methylphenyl)benzoylamino]benzoyl}-1,3,4,5-tetrahydro-1,5-benzodiazepin-2(2H)-one (400 mg) in dichloromethane (10 ml) was added dropwise at -78° C. and the mixture was stirred at the same temperature for 30 minutes. To the mixture was added triethylamine (0.537 ml) and the mixture was allowed to ambient temperature. The solution was washed with water and brine, and dried over magnesium sulfate. The solvent was evaporated in vacuo to give 1-formylmethyl-5-{4-[2-(4-methylphenyl)benzoylamino]benzoyl}-1,3,4,5-tetrahydro-1,5-benzodiazepin-2(2H)-one (301 mg) as an unstable oil. The oil was used for next step without further purification.

Provenance & Evidence