CCCC[N+](CCCC)(CCCC)CCCC.O.O.O.[F-].[Si]([O:29][CH:30]([CH2:41][CH2:42][CH2:43][CH3:44])[C:31]([NH:33][C:34]1[CH:39]=[CH:38][C:37]([CH3:40])=[CH:36][N:35]=1)=[O:32])(C(C)(C)C)(C)C.O.CCOC(C)=O>C1COCC1>[OH:29][CH:30]([CH2:41][CH2:42][CH2:43][CH3:44])[C:31]([NH:33][C:34]1[CH:39]=[CH:38][C:37]([CH3:40])=[CH:36][N:35]=1)=[O:32]
Tetrabutylammoniumfluoride trihydrate (302 mg, 0.96 mmol) was added to a stirred solution of 2-{[tert-butyl(dimethyl)silyl]oxy}-N-(5-methylpyridin-2-yl)hexanamide (Step 2) (215 mg, 0.64 mmol) in THF (5 mL). The reaction mixture was kept at ambient temperature for 1 h. Water and EtOAc were added and the two phases were separated. The organic phase was washed with water, dried over MgSO4 and concentrated in vacuo. The residue was purified with column chromatography (silica gel, eluting with DCM/EtOAc:2/1) to give the title compound as a colourless solid (135 mg), 1H NMR (300 MHz, CDCl3) δ 9.46 (br s, 1H), 8.20 (d, 1H), 8.04 (d, 1H), 7.55 (dd, 1H), 5.47 (br s, 1H), 4.29 (m, 1H), 2.31 (s, 3H), 1.98 (m, 1H), 1.76 (m, 1H), 1.52 (m, 2H), 1.38 (m, 2H), 0.92 (t, 3H).
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