Cyanamide → 2-Chloro-5-[(methylsulfinyl)methyl]pyridine

Beteiligte Stoffe

Reaktionsschritte

To a solution of sulfide (A) (3.5 g, 17 mmol) and cyanamide (1.4 mg, 34 mmol) in CH2Cl2 (30 mL) at 0° C. was added iodobenzenediacetate (11.0 g, 34 mmol) all at once. The reaction was stirred for 30 min, then allowed to warm to room temperature overnight. The mixture was diluted with CH2Cl2 (50 mL) and washed with H2O. The aqueous layer was extracted with ethyl acetate (4×50 mL), and the combined organic layers were dried over MgSO4 and concentrated. The crude product was triturated with hexanes and purified by chromatography (chromatotron, 60% acetone/hexanes) to furnish the sulfilimine (B) as a yellow gum (0.60 g, 14%). IR (film) 3008, 2924, 2143, 1693 cm−1; 1H NMR (300 MHz, CDCl3) δ 8.8 (s, 1H), 8.0 (d, 1H), 7.8 (d, 1H), 4.5 (d, 1H), 4.3 (d, 1H), 2.9 (s, 3H); LC-MS (ESI): mass calcd for C9H9F3N3S [M+H]+ 248.04. Found 248.

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