反应详情

To a solution of 3-[4-(1-ethoxycarbonyl-ethyl)-3-thioxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-yloxy]-azetidine-1-carboxylic acid tert-butyl ester (0.530 g, 1.22 mmol) in EtOH (10 mL) was added hydrazine hydrate (0.486 g, 9.72 mmol) and the mixture was heated at reflux for 2 h. The reaction mixture was cooled to ambient temperature, concentrated in vacuo and the residue was purified by column chromatography on silica gel (eluting with 20% EtOAc in petroleum ether) to give 3-(4-methyl-3-oxo-2,3,4,10-tetrahydro-9-oxa-1,2,4a-triaza-phenanthren-6-yloxy)-azetidine-1-carboxylic acid tert-butyl ester (0.234 g, 52%) as a white solid. LC/MS (Table 1, Method 3) Rt=1.332 min.; MS m/z: 389 [M+H]+.

1. temperaturethe mixture was heated
2. temperatureat reflux for 2 h
3. concentrationconcentrated in vacuo
4. customthe residue was purified by column chromatography on silica gel (eluting with 20% EtOAc in petroleum ether)