反应详情

To a solution of (S)-3-formyl-5-(1-methyl-pyrrolidin-2-yl)-4H-pyridine-1-carboxylic acid methyl ester III (0.0124 g, 0.05 mmol) in 2 mL of anhydrous MeOH was slowly added triethylamine (0.02 mL, 0.15 mmol), and the reaction mixture was stirred at RT for 1 day. Evaporation of the solvent afforded a quantitative yield (0.010 g) of (S)-5-(1-methyl-pyrrolidin-2-yl)-1,4-dihydro-pyridine-3-carbaldehyde IV as a yellow oil. The product was used without further purification. IR (thin film, neat, NaCl): 3416–3244, 2957, 1595, 1509, 1377, 1228 cm−1. 1H NMR (CDCl3, 300 MHz) δ 9.14 (s, 1 H), 6.85 (d, 1 H, J=6 Hz), 6.48 (s, 1 H), 6.00–5.99 (m, 1 H), 3.05–3.00 (m, 3 H), 2.45 (m, 1 H), 2.19–2.11 (m, 4 H), 1.83–1.67 (m, 4 H); 13C NMR (CDCl3, 75 MHz) δ 189.59, 146.95, 119.91, 119.01, 112.67, 70.03, 57.03, 40.69, 28.96, 22.80, 20.37. HRMS Calcd for C11H16N2O: 193.1341 [M+H]+. Found: 193.1334 [M+H]+. [α]28D−80.7 (c=0.55, CH2Cl2).

1. customEvaporation of the solvent