1-Methylimidazole → 2-chloro-4-(3-chlorophenyl)-alpha-(1-methyl-1H-imidazol-5-yl)-alpha-(4-methylphenyl)-6-quinazolinemethanol

Participants

Reaction Conditions

Reaction Steps

1-Methyl-1H-imidazole (0.0507 mol) was added at −70° C. to THF (90 ml) under N2 flow. nBuLi (31.5 ml) was added dropwise. The mixture was stirred at −70° C. for 15 minutes. Chlorotriethyl-silane (0.0522 mol) was added dropwise. The mixture was stirred at −70° C. for 15 minutes. nBuLi (28 ml) was added. The mixture was stirred at −70° C. for 15 minutes. A mixture of intermediate 23 (0.029 mol) in THF (115 ml) was added dropwise. The mixture was stirred at −70° C. for 1 hour, poured out into water and extracted with DCM. The organic layer was separated, washed with water, dried (MgSO4), filtered and the solvent was evaporated. The residue was purified by column chromatography over silica gel (15-35 μm) (eluent: DCM/MeOH/NH4OH; 96/4/0.1). The pure fractions were collected and the solvent was evaporated, yielding 9 g (65%). A sample (0.3 g) was crystallized from 2-propanone, The precipitate was filtered off and dried, yielding 2-chloro-4-(3-chlorophenyl)-α-(1-methyl-1H-imidazol-5-yl)-α-(4-methylphenyl)-6-quinazolinemethanol (intermediate 24), mp. 220° C.

Provenance & Evidence