反应详情

温度

100 °C

To a solution of 4-methyl-2-pivalamidopyridine 1-oxide (3.0 g, 14 mmol) in POCl3 (30 mL) was added Et3N (6.0 mL, 43 mmol) drop-wise at 0° C. Then mixture was stirred at 100° C. for 3 days. The mixture was quenched with water, treated with aqueous NaOH to pH 8-9, and extracted with ethyl acetate (50 mL×3). The combined organic extracts were dried over anhydrous Na2SO4, evaporated under vacuum and purified by chromatography on silica gel (15% ethyl acetate in petroleum ether) to afford N-(6-chloro-4-methylpyridin-2-yl)pivalamide (520 mg, 16%). 1H NMR (CDCl3, 300 MHz) δ 8.03 (s, 1H), 7.93 (br s, 1H), 6.87 (s, 1H), 2.33 (s, 3H), 1.29 (s, 9H).

1. customThe mixture was quenched with water
2. additiontreated with aqueous NaOH to pH 8-9
3. extractionextracted with ethyl acetate (50 mL×3)
4. dry with materialThe combined organic extracts were dried over anhydrous Na2SO4
5. customevaporated under vacuum
6. custompurified by chromatography on silica gel (15% ethyl acetate in petroleum ether)