[H-].[Na+].[C:3]([O:7][C:8]([N:10]1[CH2:15][CH2:14][C:13]([CH2:24][OH:25])([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=2[CH3:23])[CH2:12][CH2:11]1)=[O:9])([CH3:6])([CH3:5])[CH3:4].CI.[C:28](O)(=O)CC(CC(O)=O)(C(O)=O)O>C1COCC1.CS(C)=O>[C:3]([O:7][C:8]([N:10]1[CH2:11][CH2:12][C:13]([CH2:24][O:25][CH3:28])([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=2[CH3:23])[CH2:14][CH2:15]1)=[O:9])([CH3:5])([CH3:6])[CH3:4]
To a suspension of sodium hydride (19 mg, 0.80 mmol) in 1.5 ml of THF, at 0° C. was added a solution of N-t-butoxycarbonyl-4-hydroxymethyl-4-(2-methylbenzyl)piperidine (200 mg, 0.63 mmol) in THF (1 ml). The mixture was allowed to warm to room temperature. To this suspension was added anhydrous DMSO (0.35 ml) and the mixture was heated to 60° C. and stirred 5 hrs until the solution was almost homogeneous. The reaction mixture was allowed to cool to room temperature and methyl iodide (0.070 ml, 1.12 mmol) was added. The resulting heterogeneous mixture was stirred at room temperature for 16 hrs. The reaction mixture was treated with 10% aqueous citric acid and extracted with diethylether. The combined etheral extracts were washed successively with saturated aqueous NaHCO3 brine, dried (MgSO4), and concentrated in vacuo to a yellow gum. Chromatography (SiO2, 9% EtOAc in hexanes) afforded the product as a colorless gum.
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