Pyrrolidine → 2-Amino-7-(4-fluoro-phenyl)-4-methyl-7,8-dihydro-6H-quinazolin-5-one

Participants

Reaction Steps

To a stirred solution of 2-acetyl-5-(4-fluoro-phenyl)-cyclohexane-1,3-dione (200 mg, 0.80 mmol) from stage 1, in chloroform was added pyrrolidine (68 mg, 0.96 mmol). The reaction mixture was stirred at ambient temperature and monitored by TLC until complete disappearance of 2-acetyl-5-(4-fluoro-phenyl)cyclohexane-1,3-dione. The reaction mixture was washed with water (10 ml) and the solvent was removed under reduced pressure to give a solid m=229 mg, mass spectrum (ES-MS (+ve)) 302 [MH]+, Retention time 1.44 min, 100% UV. To a stirred solution of this solid (229 mg, 0.76 mmol) in dioxane (2.5 ml) was added guanidine carbonate (504 mg, 2.8 mmol) and the mixture heated at 100° C. and stirred for 16 h. 1,4-Dioxane was removed by evaporation under reduced pressure, water (5 ml) was added and the resulting precipitate was filtered, washed with water and heptane and air dried.

Provenance & Evidence