Ammonium Hydroxide → HCID 178477930, compound

Participants

Reaction Steps

A solution of 2,3,4,5-tetrahydro-4-[(1,1-dimethylethoxy)-carbonyl]-7-phenyl-1H-1,4-benzodiazepine (prepared from Compound B of Example 12 as described for Compound A of Example 4, 0.20 g) and 4-formyl imidazole (0.52 g, 5.6 mmol) in CH2Cl2 (10 mL) and acetic acid (2 mL) was stirred for 40 min. Sodium triacetoxyborohydride (0.9 g, 6 mmol) was added and stirring was continued for 4 hrs. Sodium bicarbonate (sat., 5 mL) and ammonium hydroxide (conc, 5 mL) were added and the mixture was stirred for another 3 hrs. The aqueous layer was extracted with CH2Cl2 (3×50 mL). The combined organic layers were washed with 1N NaOH (2×10 mL) and conc. NH4OH (10 mL), dried (Na2SO4) and evaporated. The residual solid was stirred in MeOH (5 mL) and aqueous HCl in dioxane (4M, 10 mL) overnight. The solvent was evaporated and the residue was triturated with CHCl3 to give a solid (0.35 g) which was purified by preparative HPLC (methanolwater gradient with 0.1% TFA) and converted to the HCl salt by lyophilization from 1M HCl (5 mL) to provide Example 89 (0.12 g, 57%) as an off white solid.

Provenance & Evidence