[NH2:1][C@@H:2]([CH2:9][S:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[CH2:3][C:4]([N:6]([CH3:8])[CH3:7])=O.CO.Cl>C1COCC1>[CH3:8][N:6]([CH3:7])[CH2:4][CH2:3][C@@H:2]([NH2:1])[CH2:9][S:10][C:11]1[CH:12]=[CH:13][CH:14]=[CH:15][CH:16]=1A solution of Example 1C (8.68 g) in THF (200 mL) was treated with BH3-dimethylsulfide (18.2 mL) at room temperature, stirred overnight, treated slowly with methanol (20 mL), followed by 2N HCl (50 mL), stirred overnight, and concentrated. The resulting residue was purified by silica gel chromatography eluting with 5% 7N NH3/CH3OH in dichloromethane to give the desired product.
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