2-Propanol, reaction products with ammonia, distn. residues → HCID 21082068, compound

Participants

Reaction Conditions

Reaction Steps

NH3/iPrOH (45 ml) was added dropwise at 5° C. to a mixture of 7-[chloro(4-iodophenyl)(4-methyl-4H-1,2,4-triazol-3-yl)methyl]-5-(3-chlorophenyl)-tetrazolo[1,5-a]quinazoline (0.0076 mol) in THF (45 ml). The mixture was brought to room temperature, poured out into a pressure vessel, stirred at 60° C. for 6 hours, cooled and poured out into ice water. The precipitate was filtered off and dried under a vacuum, yielding 1.6 g of a first batch of 5-(3-chlorophenyl)-α-(4-iodophenyl)-α-(4-methyl-4H-1,2,4-triazol-3-yl)-tetrazolo[1,5-a]quinazoline-7-methanamine (35%) The aqueous layer was extracted with DCM. The organic layer was separated, dried (MgSO4), filtered, and the solvent was evaporated. The residue (1.7 g) was purified by column chromatography over silica gel (eluent: toluene/iPrOH/NH4OH 84/15/1; 15–40 μm). The pure fractions were collected and the solvent was evaporated, yielding 1.03 g (23%) of a second batch of 5-(3-chlorophenyl)-α-(4-iodophenyl)-α-(4-methyl-4H-1,2,4-triazol-3-yl)-tetrazolo[1,5-a]quinazoline-7-methanamine. A sample (0.23 g) was crystallized from CH3CN, the precipitate was filtrated and dried yielding 0.09 g of 5-(3-chlorophenyl)-α-(4-iodophenyl)-α-(4-methyl-4H-1,2,4-triazol-3-yl)-tetrazolo[1,5-a]quinazoline-7-methanamine, mp. 238° C.

Provenance & Evidence