反应详情

A solution of 4-methylbenzenesulfonohydrazide (819 mg, 4.4 mmol) and dihydro-2H-pyran-4(3H)-one (487 μl, 5.28 mmol) was stirred in a Dean-Stark apparatus at 120° C. for 24 hours. The reaction mixture was cooled and evaporated at reduced pressure. The residue was purified by chromatography using a gradient of dichloromethane/ethyl acetate=100:0 to 80:20 as the eluent to give the 4-methyl-N′-(2H-pyran-4(3H,5H,6H)-ylidene)benzenesulfonohydrazide (475 mg, 40% yield) as an off white solid. MS (ISP): m/z=269.3 [M+H]+.

1. temperatureThe reaction mixture was cooled
2. customevaporated at reduced pressure
3. customThe residue was purified by chromatography