反应详情

7.46 g (23.9 mmol) of 4-(5-bromo-2-methylbenzyl)-5-hydroxymethyl-2-methyl-2,4-dihydro-3H-1,2,4-triazol-3-one and 15.8 g of active manganese dioxide were stirred for 3 hours in nitrogen atmosphere under reflux with heating in 71 ml of chloroform. The reaction solution was filtrated through celite, and the filtrate was concentrated. The residue was subjected to silica gel column chromatography (eluant: hexane/ethyl acetate-1/2 (v/v)), to obtain 5.04 g (16.3 mmol) of 4-(5-bromo-2-methylbenzyl)-5-formyl-2-methyl-2,4-dihydro-3H-1,2, 4-triazol-3-one having a melting point of 107.5° C.

1. temperatureunder reflux
2. filtrationThe reaction solution was filtrated through celite
3. concentrationthe filtrate was concentrated