Pyridine → 1-O-tert-butyl 2-O-methyl 4-methylsulfonyloxypiperidine-1,2-dicarboxylate

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[CH3:1][S:2]([Cl:3])(=[O:4])=[O:5].[CH3:24][N:25]([c:26]1[cH:27][cH:28][n:29][cH:30][cH:31]1)[CH3:32].[OH:6][CH:7]1[CH2:8][CH:9]([C:20](=[O:21])[O:22][CH3:23])[N:10]([C:13](=[O:14])[O:15][C:16]([CH3:17])([CH3:18])[CH3:19])[CH2:11][CH2:12]1.[cH:33]1[cH:34][cH:35][n:36][cH:37][cH:38]1>>[CH3:1][S:2](=[O:4])(=[O:5])[O:6][CH:7]1[CH2:8][CH:9]([C:20](=[O:21])[O:22][CH3:23])[N:10]([C:13](=[O:14])[O:15][C:16]([CH3:17])([CH3:18])[CH3:19])[CH2:11][CH2:12]1