Tetrahydrofuran → 2-(4-methoxy-benzyl)-4-[2-(2-methoxy-ethoxy)-ethoxy]-2,3-dihydro-1H-isoindole

Temperature

60 °C

2-(4-Methoxy-benzyl)-4-[2-(2-methoxy-ethoxy)-ethoxy]-isoindole-1,3-dione (149 mg, 0.38 mmol) was treated with a 1M solution of lithium aluminium hydride in THF (5 mL, 5 mmol). The mixture was maintained at r.t. for 4 hours, 60° C. for 1 hour, then r.t. for a further 18 hours. The mixture was then cooled in ice and quenched by the dropwise addition of water (0.2 mL), 2N sodium hydroxide solution (0.4 mL) and water (0.4 mL). Magnesium sulfate was added, followed by ethyl acetate and then the mixture was stirred at r.t. for 15 minutes. The solids were removed by filtration, being well washed with ethyl acetate. Concentration of the filtrate gave a residue which was absorbed onto an SCX cartridge and washed with 5% methanol/dichloromethane then eluted with 10% 1M ammonia in methanol/dichloromethane to afford the title compound (134 mg, 97%). 1H NMR (methanol-d4) 7.43-7.39 (2H, m), 7.27 (1H, t), 6.99-6.96 (2H, m), 6.90 (1H, d), 6.88 (1H, d), 4.33 (2H, s), 4.28 (2H, s), 4.23 (2H, s), 4.18-4.15 (2H, m), 3.85-3.79 (5H, m), 3.67-3.64 (2H, m), 3.54-3.51 (2H, m), 3.33 (3H, s). MS: [M+H]+ 358.

1. temperatureThe mixture was then cooled in ice
2. customquenched by the dropwise addition of water (0.2 mL), 2N sodium hydroxide solution (0.4 mL) and water (0.4 mL)
3. additionMagnesium sulfate was added
4. customThe solids were removed by filtration
5. washbeing well washed with ethyl acetate
6. customConcentration of the filtrate gave a residue which
7. customwas absorbed onto an SCX cartridge
8. washwashed with 5% methanol/dichloromethane
9. washthen eluted with 10% 1M ammonia in methanol/dichloromethane

ORD record

ord-3823c6fe67594f789740ff2827bba728

Source dataset

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08106057B2