3,4-Dichlorobenzaldehyde → (E)-5-(3,4-dichlorostyryl)-2,3-dihydro-8-(3-methoxyphenyl)-1-methyl-1H-1,4-benzodiazepine dihydrochloride

Participants

Reaction Steps

To 100 mg (0.24 mmol) of [8-(3-methoxyphenyl)-1-methyl-1,2,3,4-tetrahydrobenzo[e][1,4]diazepin-5-ylidenemethyl]phosphonic acid diethyl ester in 2 ml of tetrahydrofuran was added 17 mg (0.42 mmol) of sodium hydride (60% dispersion in mineral oil). After 10 minutes 44 mg (0.25 mmol) of 3,4-dichlorobenzaldehyde was added and the mixture was stirred for 3 hours. The product was purified by column chromatography (20 g IST pre-packed column) eluting with 1% methanol/ethyl acetate and treated with 0.10 ml of 4M hydrogen chloride in dioxan. The solvent was evaporated to leave a red gum which was recrystallized from ethyl acetate to give 25 mg of (E)-5-(3,4-dichlorostyryl)-2,3-dihydro-8-(3-methoxyphenyl)-1-methyl-1H-1,4-benzodiazepine dihydrochloride as an orange solid; MS: m/e 436 (M+).

Provenance & Evidence