[OH:1][C:2]1[CH:9]=[CH:8][C:7]([N:10]2[CH:14]=[N:13][N:12]=[N:11]2)=[CH:6][C:3]=1[CH:4]=[O:5].C(=O)([O-])[O-].[K+].[K+].[CH:21]1(Br)[CH2:25][CH2:24][CH2:23][CH2:22]1.O>CN(C)C=O>[CH:21]1([O:1][C:2]2[CH:9]=[CH:8][C:7]([N:10]3[CH:14]=[N:13][N:12]=[N:11]3)=[CH:6][C:3]=2[CH:4]=[O:5])[CH2:25][CH2:24][CH2:23][CH2:22]1A mixture of 2-hydroxy-5tetrazol-1-yl-benzaldehyde (500 mg) and potassium carbonate (431 mg) in dimethylformamide (5 ml) at 20° was treated with cyclopentyl bromide (0.33 ml). After 24 h water (20 ml) was added and the mixture extracted with ethyl acetate (2×25 ml). The organics were washed with water (25 ml) and brine (25 ml) and dried (Na2SO4). Evaporation gave a yellow solid which was purified by FCC (ethyl acetate/cyclohexane (2:1)) to give the title compound, as a yellow solid (334 mg).
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