反応 #1555984

反応方程式

HCl

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

sodium

→

pure product

収率 97.0%

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

収率 97.0%

溶媒

i-PrOH

反応条件

後処理

1. 1
   温度The reaction mixture was refluxed for 1 h
2. 2
   温度cooled
3. 3
   その他15 ml of i-PrOH were removed in vacuo and 10 ml of H20
4. 4
   workup.ADDITIONwere added
5. 5
   その他in the fridge overnight
6. 6
   その他The white precipitate formed
7. 7
   ろ過was filtered off
8. 8
   洗浄washed with water (2×3 ml)
9. 9
   乾燥with cyclohexane and dried in vacuo

実験手順

An isopropanolic solution of i-PrONa, obtained by dissolving of sodium (0.017 g, 0.713 mmol, 1 equiv) in i-PrOH (16 ml), was treated with methyl[(4E)-1-benzyl-5-oxo-4-{1-[(pyridin-2-ylmethyl)amino]ethylidene}-4,5-dihydro-1H-pyrazol-3-yl]acetate (Compound of Formula (VIII) (0.270 g, 0.713 mmol, 1 equiv.). The reaction mixture was refluxed for 1 h, then cooled and neutralized to pH 7 by addition of 0.12 ml of a 20% aqueous HCl solution. 15 ml of i-PrOH were removed in vacuo and 10 ml of H20 were added before placing the flask in the fridge overnight. The white precipitate formed was filtered off, washed with water (2×3 ml), then with cyclohexane and dried in vacuo. 0.240 g of pure product 2-benzyl-4-methyl-5-(pyridin-2-ylmethyl)-1H-pyrazolo[4,3-c]pyridine-3,6(2H,5H)-dione was obtained. Yield 97%. 1H NMR (500 MHz, DMSO-d6, ppm) 2.78 (s, 3H), 4.81 (s, 2H), 5.37 (s, 2H), 5.59 (s, 1H), 7.31-7.26 (m, 5H), 7.36 (m, 2H), 7.76 (td, J 7.6, 1.9 Hz, 1H), 8.46 (dt, J 4.2, 1.6 Hz, 1H), 10.34 (s, 1H); MS (ESI+)=347.2.

出典