反応 #5441

反応方程式

diester

7-Bromo-4-methoxy-1H-indene-2,3-dicarboxylic acid, diethyl ester

→

desired product

収率 96.9%

4-Methoxy-2,3-dihydro-1H-indene-2,3-dicarboxylic acid, diethyl ester

収率 96.9%

溶媒

ethanol

反応条件

後処理

1. 1
   ろ過The catalyst was filtered
2. 2
   その他the solvent evaporated
3. 3
   workup.DISSOLUTIONThe product was dissolved in ether
4. 4
   洗浄washed with 5% NaHCO3
5. 5
   乾燥dried (MgSO4)
6. 6
   その他the solvent was evaporated

実験手順

The diester from Example 2 (19.39 g) was dissolved in 250 ml ethanol. To the solution was added 5.20 g of 10% Pd/BaSO4 and 7.15 g NaOAc.3H2O. The reaction was hydrogenated at 4 atm pressure. The catalyst was filtered and the solvent evaporated. The product was dissolved in ether, washed with 5% NaHCO3, dried (MgSO4), and the solvent was evaporated to yield 14.87 g of the desired product as a colorless oil. NMR (CDCl3) δ1.20 (t, 3H), 1.27 (t, 3H), 3.13 (dd, 1H), 3.48-3.56 (m, 2H), 3.82 (s, 3H), 3.95-4.22 (m, 4H), 4.39 (d, 1H), 6.70 (d, 1H), 6.87 (d, 1H), 7.21 (t, 1H).

出典