[CH2:1]([O:4][N:5]([C@H:18]1[CH2:23][NH:22][C@H:21]([C:24]([NH2:26])=[O:25])[C:20]([CH2:27][CH3:28])=[CH:19]1)S(C1C=CC=CC=1[N+]([O-])=O)(=O)=O)[CH:2]=[CH2:3].C(ON[C@@H]1C(C)=C[C@@H](CO[Si](C(C)(C)C)(C)C)NC1)C=C>CO.ClCCl>[CH2:1]([O:4][NH:5][CH:18]1[CH2:23][NH:22][C@@H:21]([C:24]([NH2:26])=[O:25])[C:20]([CH2:27][CH3:28])=[CH:19]1)[CH:2]=[CH2:3]The title compound was prepared from (2S,5R)-5-(N-(allyloxy)-2-nitrophenylsulfonamido)-3-ethyl-1,2,5,6-tetrahydropyridine-2-carboxamide (Intermediate 213, 0.87 g, 2.12 mmol) following the procedure described for Intermediate 12. Silica gel chromatography (0%-8% methanol/dichloromethane) afforded the title compound (0.355 g, 74.3%) as an off-white solid upon drying on high-vacuum.
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