Diethyl squarate → HCID 89526285, compound
Reaction equation
[NH2:1][C:2]1[C:10]2[O:9][C:8](=[O:11])[NH:7][C:6]=2[CH:5]=[CH:4][CH:3]=1.[CH2:12]([O:14][C:15]1[C:16](=O)[C:17](=[O:22])[C:18]=1[O:19]CC)[CH3:13]>C(O)C>[CH2:12]([O:14][C:15]1[C:18](=[O:19])[C:17](=[O:22])[C:16]=1[NH:1][C:2]1[C:10]2[O:9][C:8](=[O:11])[NH:7][C:6]=2[CH:5]=[CH:4][CH:3]=1)[CH3:13]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
A mixture of 0.247 g of 7-amino-3H-benzooxazol-2-one (1.6 mmol, 1 eq) and 0.36 ml of 3,4-diethoxycyclobut-3-ene-1,2-dione (2.5 mmol, 1.5 eq) in 9 ml of ethanol was stirred at ambient temperature for 2 days (formation of a precipitate). Ethanol was added in order to promote the fall of the precipitate, which was filtered off, washed with diethyl ether and dried under vacuum at 45° C. 0.35 g of product was obtained in the form of a light khaki solid. Yield=78%.