[CH2:1]([O:4][C:5](=[O:22])[NH:6][C:7]1[CH:8]=[C:9]2[C:13](=[CH:14][CH:15]=1)[NH:12][CH:11]=[C:10]2[CH2:16][CH2:17][NH:18][C:19](=[O:21])[CH3:20])[CH:2]=[CH2:3].B.C1C[O:27]CC1.[OH-].[Na+].OO>C1COCC1>[OH:27][CH2:3][CH2:2][CH2:1][O:4][C:5](=[O:22])[NH:6][C:7]1[CH:8]=[C:9]2[C:13](=[CH:14][CH:15]=1)[NH:12][CH:11]=[C:10]2[CH2:16][CH2:17][NH:18][C:19](=[O:21])[CH3:20][3-(2-Acetylamino-ethyl)-1H-indol-5-yl]-carbamic acid allyl ester (1 mmol) is dissolved in THF (27 mL) and borane-THF (2 mmol) added dropwise. After 2 h, sodium hydroxide (4 mL of 3 M) and hydrogen peroxide (4 mL of 30%) are added and the solution stirred an additional 1 h. The solution is concentrated to half its volume, 10 mL water is added and it is extracted with ethyl acetate (4×25 mL). The combined extracts are washed with brine, dried, the solvent removed in vacuo, and the product chromatographed on silica gel with 5% methanol in chloroform as eluent.
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