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With chloro-trimethyl-silane; at 20℃; for 16h; |
To a stirred solution of <strong>[88912-21-4]6-chloro-4-methoxypyridine-2-carboxylic acid</strong> (5.00 g, 26.7 mmol) in ethanol (75 ml_), chlorotrimethylsilane (15 ml_) is added. The reaction mixture is stirred at rt for 16 h before the solvent is evaporated. The remaining residue is dried under vacuum to give 6-chloro-4-methoxy-2-carboxylic acid ethyl ester (5.95 g) as a pale yellow oil; LC-MS: tR = 0.85 min; [IVM]+ = 215.97; 1H NMR (CDCI3): delta lambda AA (t, J = 7.0 Hz, 3 H), 3.94 (s, 3 H), 4.48 (q, J = 7.0 Hz, 2 H), 7.01 (d, J = 2.0 Hz, 1 H), 7.61 (d, J = 2.0 Hz, 1 H). |
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With chloro-trimethyl-silane; at 20℃; for 16h; |
a) To a stirred solution of <strong>[88912-21-4]6-chloro-4-methoxypyridine-2-carboxylic acid</strong> (5.00 g, 26.7 mmol) in ethanol (75 mL), chlorotrimethylsilane (15 mL) is added. The reaction mixture is stirred at rt for 16 h before the solvent is evaporated. The remaining residue is dried under vacuum to give 6-chloro-4-methoxy-2-carboxylic acid ethyl ester (5.95 g) as a pale yellow oil; LC-MS: tR=0.85 min; [M+1]+=215.97; 1H NMR (CDCl3): delta 1.44 (t, J=7.0 Hz, 3H), 3.94 (s, 3H), 4.48 (q, J=7.0 Hz, 2H), 7.01 (d, J=2.0 Hz, 1H), 7.61 (d, J=2.0 Hz, 1H). |
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With chloro-trimethyl-silane; at 20℃; for 16h; |
To a stirred solution of <strong>[88912-21-4]6-chloro-4-methoxypyridine-2-carboxylic acid</strong> (5.00 g, 26.7 mmol) in ethanol (75 mL), chlorotrimethylsilane (15 mL) is added. The reaction mixture is stirred at rt for 16 h before the solvent is evaporated. The remaining residue is dried under vacuum to give 6-chloro-4-methoxy-2-carboxylic acid ethyl ester (5.95 g) as a pale yellow oil; LC- MS: tR = 0.85 min; [M+1]+ = 215.97; 1H NMR (CDCI3): delta 1.44 (t, J = 7.0 Hz, 3 H), 3.94 (s, 3 H), 4.48 (q, J = 7.0 Hz, 2 H), 7.01 (d, J = 2.0 Hz, 1 H), 7.61 (d, J = 2.0 Hz, 1 H). |