N,N,N',N'-Tetramethylazodicarboxamide → (E)-5-(3,4-dichlorostyryl)-2,3-dihydro-1-methyl-8-(2-thenyloxy)-1H-1,4-benzodiazepine

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To a stirred solution of 50 mg (0.14 mmol) of (E)-5-(3,4-dichlorostyryl)-2,3-dihydro-1-methyl-1H-1,4-benzodiazepin-8-ol (prepared as described in Example 157) in 5 ml of dry tetrahydrofuran was added 0.014 ml (0.14 mmol) of thiophene-2-methanol and 0.053 ml (0.21 mmol) of tributylphosphine. The solution was cooled, under an atmosphere of nitrogen, to 0° C. and 37 mg (0.21 mmol) of 1,1′-azobis(N,N-dimethylformamide) was added. The mixture was allowed to warm up to room temperature and then stirred for 16 hours. A further 0.053 ml (0.21 mmol) of tributylphosphine and 37 mg (0.21 mmol) of 1,1′-azobis(N,N-dimethylformamide) were added and the mixture stirred for a further 4 hours. The mixture was filtered and the filtrate evaporated and then chromatographed on silica gel using dichloromethane/methanol (98:2) for the elution. There was obtained 4.2 mg of (E)-5-(3,4-dichlorostyryl)-2,3-dihydro-1-methyl-8-(2-thenyloxy)-1H-1,4-benzodiazepine as an orange gum MS: m/e 442.8 [M+H]+.

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