反应 #1340632

反应方程式

HCl

methyl[(4Z)-1-methyl-5-oxo-4-{1-[(pyridin-2-ylmethyl)amino]pentylidene}-4,5-dihydro-1H-pyrazol-3-yl]acetate

sodium

→

pure product

收率 80.0%

4-butyl-2-methyl-5-(pyridin-2-ylmethyl)-1H-pyrazolo[4,3-c]pyridine-3,6(2H,5H)-dione

收率 80.0%

溶剂

i-PrOH

反应条件

后处理

1. 1
   温度The reaction mixture was refluxed for 1 h
2. 2
   温度cooled
3. 3
   其他50 ml of i-PrOH were removed in vacuo and 25 ml of H2O
4. 4
   workup.ADDITIONwere added
5. 5
   其他in the fridge overnight
6. 6
   其他The white precipitate formed
7. 7
   过滤was filtered off
8. 8
   洗涤washed with water (2×5 ml)
9. 9
   干燥with cyclohexane and dried in vacuo

实验过程

An isopropanolic solution of i-PrONa, obtained by dissolving of sodium (0.082 g, 3.57 mmol, 1 equiv.) in i-PrOH (75 ml), was treated with methyl[(4Z)-1-methyl-5-oxo-4-{1-[(pyridin-2-ylmethyl)amino]pentylidene}-4,5-dihydro-1H-pyrazol-3-yl]acetate (Compound of Formula (VIII) (0.61 g, 3.57 mmol, 1 equiv.). The reaction mixture was refluxed for 1 h, then cooled and neutralized to pH 7 by addition of 0.59 ml of a 20% aqueous HCl solution. 50 ml of i-PrOH were removed in vacuo and 25 ml of H2O were added before placing the flask in the fridge overnight. The white precipitate formed was filtered off, washed with water (2×5 ml), then with cyclohexane and dried in vacuo. 0.88 g of pure product 4-butyl-2-methyl-5-(pyridin-2-ylmethyl)-1H-pyrazolo[4,3-c]pyridine-3,6(2H,5H)-dione was obtained. Yield 80%. 1HNMR (DMSO-d6, 400 MHz): 0.80 (3H, t, J=7.2 Hz); 1.29-1.35 (2H, m); 1.38-1.43 (2H, m); 3.19 (3H, s); 3.22-3.24 (2H, m); 5.49 (2H, s); 5.72 (1H, s); 7.42 (1H, d, J=8 Hz); 7.62 (1H, t, J=6.6 Hz); 8.12 (1H, t, J=8 Hz); 8.65 (1H, d, J=5.2 Hz). MS (ESI+): 313.4; MS (ESI−): 311.3.

来源