[CH2:1]([C:4]1([OH:17])[CH2:9][CH2:8][N:7]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:6][CH2:5]1)[CH:2]=[CH2:3].CN(C1C=CC=CN=1)C.[C:27](OC(=O)C)(=[O:29])[CH3:28].C(N(CC)CC)C>ClCCl>[C:27]([O:17][C:4]1([CH2:1][CH:2]=[CH2:3])[CH2:9][CH2:8][N:7]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:6][CH2:5]1)(=[O:29])[CH3:28]A solution of tert-butyl 4-allyl-4-hydroxypiperidine-1-carboxylate (3.7 g, 14.51 mmol) in dichloromethane (20 mL) was treated with dimethylaminopyridine (1.8 g, 14.51 mmol), acetic anhydride (4.1 mL, 43.53 mmol) and triethylamine (6.1 mL, 43.53 mmol), and was stirred overnight at 20° C. The solvent was removed under reduced pressure and the residue was partitioned between water and ethyl acetate. The aqueous layer was extracted twice with ethyl acetate. Combined organic extracts were washed with water, dried (Na2SO4) and filtered. The filtrate was concentrated under reduced pressure, and purified by a standard method to provide the title compound 44B (3.4 g). LC-MS: m/z 284.4 (M+H)+
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