反应详情

A stirred solution of 2.19 g of 2-amino-N-methyl-α-(3-methyl-2-thienyl)benzeneethanamine and 9.88 g of trimethyl orthobenzoate was treated rapidly with 2.4 ml of glacial acetic acid, and heated under reflux for 8 hours. The solution was concentrated at 75° C. on a rotary evaporator (vacuum pump) to a syrup. The syrup was then partioned between 10% hydrochloric acid solution (50 ml) and ether. The aqueous phase was extracted again with ether, basified with 10% sodium hydroxide solution (60 ml) and extracted with dichloromethane (2×100 ml). The combined organic phase was dried over anhydrous sodium sulfate, filtered, and concentrated to an oil. The oil was purified by preparative HPLC (Water's Associates Prep LC/System 500A, silica gel, sample applied in dichloromethane, 2% triethylamine in methanol as the eluent). Concentration of the appropriate fractions yielded 2.70 g of 4,5-dihydro-3-methyl-4-(3-methyl-2-thienyl)-2-phenyl-3H-1,3-benzodiazepine as an oil.

1. temperatureheated
2. temperatureunder reflux for 8 hours
3. concentrationThe solution was concentrated at 75° C. on a rotary evaporator (vacuum pump) to a syrup
4. extractionThe aqueous phase was extracted again with ether
5. extractionextracted with dichloromethane (2×100 ml)
6. dry with materialThe combined organic phase was dried over anhydrous sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated to an oil
9. customThe oil was purified by preparative HPLC (Water'