反应详情

To a solution of 3-[4-(1-ethoxycarbonyl-ethyl)-7-fluoro-3-thioxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-yloxy]-3-methyl-azetidine-1-carboxylic acid tert-butyl ester (0.080 g, 0.171 mmol) in EtOH (5 mL) was added hydrazine hydrate (0.085 g, 1.707 mmol) and the mixture was heated to reflux for 2 h. The reaction mixture was cooled to ambient temperature and concentrated in vacuo. The residue was purified by preparative TLC (eluting with 30% EtOAc in petroleum ether) to give 3-(7-fluoro-4-methyl-3-oxo-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-yloxy)-3-methyl-azetidine-1-carboxylic acid tert-butyl ester (0.033 g, 46%) as a white solid. LC/MS (Table 1, Method 2) Rt=1.144 min.; MS m/z: 421 [M+H]+.

1. temperaturethe mixture was heated
2. temperatureto reflux for 2 h
3. concentrationconcentrated in vacuo
4. customThe residue was purified by preparative TLC (eluting with 30% EtOAc in petroleum ether)