[C:1]1(C)[C:2]([S:7](Cl)(=[O:9])=[O:8])=[CH:3][CH:4]=[CH:5][CH:6]=1.[OH:12][CH2:13][C@H:14]1[O:19][CH2:18][CH2:17][N:16]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:15]1.[CH2:27](N(CC)CC)C>CN(C1C=CN=CC=1)C.ClCCl>[S:7]([O:12][CH2:13][C@H:14]1[O:19][CH2:18][CH2:17][N:16]([C:20]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])[CH2:15]1)([C:2]1[CH:1]=[CH:6][C:5]([CH3:27])=[CH:4][CH:3]=1)(=[O:8])=[O:9]Toluene suiphonyl chloride (0.513 g, 2.69 mmol) was added to a solution of (S)-tert-butyl 2-(hydroxymethyl)morpholine-4-carboxylate (0.390 g, 1.79 mmol), triethylamine (0.50 mL, 3.59 mmol) and DMAP (cat.) in dichloromethane (11 mL). The reaction mixture was stirred for 24 h then diluted with dichloromethane (25 ml) and washed sequentially with water (25 mL) and 0.2M HCl (25 mL). The organic phase was dried (Na2SO4) and the solvent was removed in vacuo. The crude product was purified by flash column chromatography on silica gel, eluting with ethyl acetate/hexane (1/5), to give the title compound as a colourless solid (0.650 g, 97%).
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