1,8-Diazabicyclo(5.4.0)undec-7-ene → 4-(2-cyanoimino-3-methylimidazolidin-1-yl)-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile

Participants

Reaction Conditions

Reaction Steps

To a suspension of trans-3-acetoxy-4-(2-cyanoimino-3-methylimidazolidin-1-yl)-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile (0.45 g) in toluene (9 ml) was added 1,8-diazabicyclo[5.4.0]undec-7-ene (0.23 ml), and the reaction mixture was stirred at 100° C. for 2 hours and 40 minutes. The solvent was removed under reduced pressure. The residue was poured into water (30 ml) and then extracted with ethyl acetate (45 ml). The organic layer was washed with brine (30 ml), dried over magnesium sulfate and evaporated in vacuo. The residue was recrystallized from ethanol to give 4-(2-cyanoimino-3-methylimidazolidin-1-yl)-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile (0.27 g).

Provenance & Evidence