反应详情

A mixture of 2-(2,4-dimethoxybenzyl)-2,3-dihydro-1H-isoindole-5-carboxylic acid methyl ester (4.65 g; 14.2 mmol) and lithium hydroxide monohydrate (660 mg; 1.1 equiv.) in 4:1:1 THF-MeOH—H2O (60 ml) was stirred at room temperature overnight. A further 170 mg of base were added and stirring continued for 7 hours. The reaction was evaporated then re-evaporated with MeOH/toluene (×2). A mixture of the crude 2-(2,4-dimethoxy-benzyl)-2,3-dihydro-1H-isoindole-5-carboxylic acid lithium salt (1.5 g; 4.7 mmol), morpholine (820 μl; 2 equiv.), EDAC (1.1 g; 1.2 equiv.) and HOBt (760 mg; 1.2 equiv.) in DMF (25 ml) was stirred at room temperature overnight then evaporated in vacuo. The residue was partitioned between EtOAc and saturated NaHCO3, the EtOAc layer was separated, washed with brine, dried (MgSO4) and evaporated. Purification by flash column chromatography (2% then 5% MeOH/DCM as eluant) gave 1.1 g of [2-(2,4-dimethoxybenzyl)-2,3-dihydro-1H-isoindol-5-yl]-morpholin-4-yl-methanone as a red/brown gum. 1H NMR (DMSO-d6) 7.30-7.18 (4H, m), 6.56 (1H, d), 6.52 (1H, dd), 3.85 (4H, s), 3.78 (5H, m), 3.73 (3H, s).

1. stirringstirring
2. waitcontinued for 7 hours
3. customThe reaction was evaporated
4. customthen re-evaporated with MeOH/toluene (×2)
5. stirringwas stirred at room temperature overnight
6. customthen evaporated in vacuo
7. customThe residue was partitioned between EtOAc and saturated NaHCO3
8. customthe EtOAc layer was separated
9. washwashed with brine
10. dry with materialdried (MgSO4)
11. customevaporated
12. customPurification by flash column chromatography (2%