Ethyl orthoformate → 7-Methoxy-6-benzyloxyquinazolone

Participants

Reaction Steps

2-Amino-4-methoxy-5-benzyloxybenzamide (JMC, 20, 146) (5 g) was mixed with triethylorthoformate (15 ml) and refluxed overnight. The reaction solution was cooled and triturated with EtOAc (40 ml) then filtered to give 7-methoxy-6-benzyloxyquinazolone (3.2 g). This product was mixed with DIPEA (15 ml) and to the solution was added POCl3 (3 ml) slowly. The reaction mixture was refluxed for 30 minutes and cooled, then poured into a stirred mixture of ice and CHCl3. The solution was further extracted with CHCl3 three times and washed with H2O followed by brine, dried over Na2SO4 and evaporated to give a light brown solid as the chloride for next step without further purification.

Provenance & Evidence