Guanidine Hydrochloride → 2-Amino-4-(1-cyclobutyl-2-methylimidazol-5-yl)pyrimidine

Participants

Reaction Steps

5-(3-Dimethylaminoprop-2-en-1-oyl)-1-cyclobutyl-2-methylimidazole (Method 37; 466 mg, 2 mmol) and guanidine hydrochloride (476 mg, 5 mmol) were suspended in 1-butanol (10 ml). Sodium methoxide (432 g, 8 mmol) was added in one portion and the mixture heated under reflux, under an atmosphere of nitrogen, for 2 hours. The reaction mixture was allowed to cool to ambient temperature and was pre-absorbed on to silica gel and purified by column chromatography on silica gel eluting with DCM/2% methanolic ammonia (100:0 increasing in polarity to 97:3) to give the title compound (301 g, 66%). NMR: 1.73 (m, 2H), 2.45 (m, 7H), 5.36 (m, 1H), 6.58 (s, 2H), 6.72 (d, 1H), 7.24 (s, 1H), 8.16 (d, 1H); m/z 230

Provenance & Evidence