反应详情

A mixture of 4-hydroxymethyl-2-methyl-8-[2'-(1-tert-butyl-1H-tetrazol-5-yl)biphenyl-4-ylmethyl]-5,8-dihydro-6H-pyrido[2,3-d]pyrimidin-7-one (550 mg, 1.14 mmol), methanesulfonic acid (1.10 g, 11.40 mmol), and toluene (10 mL) was heated under reflux for 4 days. The mixture was concentrated, 1N KOH (11.4 mL) was added, and the mixture was extracted with CHCl3 (discarded). The aqueous phase was acidified to pH4-5 with 1N HCl and extracted with CHCl3. The extracts were dried and concentrated to give 94 mg of a yellow foam. Trituration with acetone and recrystallization from EtOH gave 46 mg (9%) of product as a white solid, mp 246°-247° C.

1. temperaturewas heated
2. temperatureunder reflux for 4 days
3. concentrationThe mixture was concentrated
4. addition1N KOH (11.4 mL) was added
5. extractionthe mixture was extracted with CHCl3 (discarded)
6. extractionextracted with CHCl3
7. customThe extracts were dried
8. concentrationconcentrated