[CH:1]([C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[C:9]([NH:13][C:14](=[O:21])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)=[N:8][CH:7]=[CH:6]2)=[O:2].[BH4-].[Na+].O>O1CCCC1.CO>[OH:2][CH2:1][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][CH:12]=1)[C:9]([NH:13][C:14](=[O:21])[C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=1)=[N:8][CH:7]=[CH:6]2To a stirred suspension of 1.23 g of 1f in 40 mL of tetrahydrofuran and 15 mL of methanol was added 217 mg sodium borohydride in small portions. After stirring the mixture at ambient temperature for 5 min, 50 mL of water was added and tetrahydrofuran and methanol were removed in vacuo. Brine was added and the mixture was extracted with ethyl acetate. The ethyl acetate extract was dried (MgSO4) and concentrated under reduced pressure giving 1.27 g of 1g. 1H-NM 200 MHz (CDCl3) δ: 4.75 (2H, s), 6.95 (1H, br.s), 7.30-7.55 (7H, m), 8.25-8.38 (2H, m), 8.69 (1H, br.s).
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