[H-].[Na+].[CH:3]1([N:8]([C:14]2[C:19]([CH:20]=O)=[CH:18][N:17]=[C:16]([S:22][CH3:23])[N:15]=2)[CH2:9][C:10]([O:12][CH3:13])=[O:11])[CH2:7][CH2:6][CH2:5][CH2:4]1.O>CCCCCC.C1C=CC=CC=1>[CH:3]1([N:8]2[C:14]3[N:15]=[C:16]([S:22][CH3:23])[N:17]=[CH:18][C:19]=3[CH:20]=[C:9]2[C:10]([O:12][CH3:13])=[O:11])[CH2:7][CH2:6][CH2:5][CH2:4]1Sodium hydride (3.85 g, 167 mmol) (freshly washed with hexane) was added to a solution of compound 226 (12.95 g, 41.9 mmol) in benzene (150 mL). The reaction was stirred at 70° C. After 1 h, the reaction contents were poured into water (300 mL) and extracted with ethyl acetate (2×100 mL). The combined organics were washed with brine, dried over MgSO4, and concentrated in vacuo. Silica gel chromatography (gradient elution 0 to 50% ethyl acetate in hexanes) afforded compound 227 (4.24 g, 34.8% yield).
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