[NH2:1][C@@H:2]1[C:7]2[CH:8]=[C:9]([C:12]#[N:13])[CH:10]=[CH:11][C:6]=2[O:5][C:4]([CH3:15])([CH3:14])[C@H:3]1[OH:16].C(N(CC)CC)C.[CH2:24]([O:26][C:27](Cl)=[O:28])[CH3:25]>ClCCl>[C:12]([C:9]1[CH:10]=[CH:11][C:6]2[O:5][C:4]([CH3:14])([CH3:15])[C@@H:3]([OH:16])[C@H:2]([NH:1][C:27]([O:26][CH2:24][CH3:25])=[O:28])[C:7]=2[CH:8]=1)#[N:13]To trans-4-amino-6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-3-ol (1.09 g) and triethylamine (0.77 ml) in dichloromethane (20 ml), cooled in an ice bath, was added ethylchloroformate (0.67 ml). The mixture was allowed to attain room temperature and stirred for 2 days. The reaction mixture was washed with water and dried over anhydrous magnesium sulphate. Filtration and evaporation and chromatography (chromatotron, gradient elution: 10-30% Ethyl acetate-pentate) gave one fraction (456 mg) which was recrystallised from ethyl acetate-pentane to give the compound of this example (319 mg); mp 147°-148° C.
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