C1C=C(Cl)C=C(C(OO)=[O:9])C=1.[Cl:12][C:13]1[C:14]([CH3:24])=[N:15][CH:16]=[C:17]([CH:19]2[O:23][CH2:22][CH2:21][O:20]2)[CH:18]=1.C([O-])(O)=O.[Na+].[OH-].[Na+]>C(Cl)Cl>[Cl:12][C:13]1[C:14]([CH3:24])=[N+:15]([O-:9])[CH:16]=[C:17]([CH:19]2[O:23][CH2:22][CH2:21][O:20]2)[CH:18]=1m-CPBA (626 mg, 2.72 mmol) was added to a suspension of 3-chloro-5-(1,3-dioxolan-2-yl)-2-methylpyridine (271.4 mg, 1.359 mmol) and NaHCO3 (343 mg, 4.08 mmol) in DCM (3 ml) and stirred at room temperature. After 21 h, HPLC showed full conversion. DCM and 1M NaOH were added. It was extracted, dried (MgSO4), filtered, and concentrated yielding 3-chloro-5-(1,3-dioxolan-2-yl)-2-methylpyridine 1-oxide (228 mg, 78%) as a pale yellow oil pure enough to be used in the next step.
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