Scheme 1: Synthesis of 8-substituted imidazobenzodiazepines following chemistry earlier developed by Sternbach, Fryer et al. Reagents and Conditions. (a) Bromoacetyl bromide, sodium bicarbonate, and chloroform; (b) ammonia (anhydrous), methanol, and reflux; (c) bromine, sulfuric acid, and acetic acid; (d) sodium hydride, diethyl chlorophosphate, and tetrahydrofuran; (e) sodium hydride, ethyl isocyanoacetate, and tetrahydrofuran, −30°C to r.t.; (f) tributyl(phenyl)stannane, Pd(PPh3)4.