o-Bis(bromomethyl)benzene → HCID 53888344, compound

Participants

Reaction Steps

3.56 g (10 mmol) of (S)-1-(5-aminomethyl-1,2,4-oxadiazol-3-yl)-8-chloro-12,12a-dihydro-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepin-9-one, 15 ml of methylene chloride, 8.6 ml (50 mmol) of N-ethyldiisopropylamine and 2.64 g (10 mmol) of α,α'-dibromo-o-xylene were stirred at room temperature for 20 hours. The reaction solution was washed three times with water, dried over magnesium sulfate and evaporated. The residue was chromatographed on 500 g of silica gel while eluting with methylene chloride/methanol 19/1. There were obtained 1.55 g (33%) of (S)-8-chloro-12,12a-dihydro-1-(5-isoindolin-2-ylmethyl-1,2,4-oxadiazol-3-yl)-9H,11H-azeto[2,1-c]imidazo[1,5-a][1,4]benzodiazepin-9-one, which was converted into the hydrochloride of m.p. 218°-222°.

Provenance & Evidence