反应详情

390 mg (1.603 mmol) of (±)-2-methyl-3-oxo-6-[(1-imidazolyl)-methyl]-3,4-dihydro-2H-1,4-benzoxazine is dissolved in 42 ml of dimethoxyethane, mixed with 1.297 g (3.206 mmol) of Lawesson's reagent and stirred for 46 hours at room temperature. After the solvent is spun in, the residue is chromatographed on silica gel (mobile solvent: methylene chloride/ethanol). The fractions that are obtained by chromatography are removed from the polar contaminants by shaking with saturated sodium bicarbonate solution. 238.5 mg (57%) of the desired product is isolated, ting point 206-210° C.

1. customis chromatographed on silica gel (mobile solvent: methylene chloride/ethanol)
2. customThe fractions that are obtained by chromatography
3. customare removed from the polar contaminants
4. stirringby shaking with saturated sodium bicarbonate solution