Tetrahydrofuran → 3-(3-aminophenyl)-3-methoxy-4,5,6,7-tetrahydro-2-benzofuran-1(3H)-one

To a solution of 3,4,5,6-tetrahydrophthalic acid anhydride (3.04 g) in tetrahydrofuran (40.0 mL) was added a solution of 3-(bis(trimethylsilyl)amino)phenylmagnesium chloride in tetrahydrofuran (1M, 20.0 mL) at −78° C. The mixture was stirred for 1.5 hours. A saturated aqueous ammonium chloride solution was added to the reaction mixture, which was stirred at room temperature for 30 minutes. Anhydrous magnesium sulfate was added to the reaction mixture, which was filtrated. The filtrate was concentrated to give an oily product. Thionyl chloride (5.20 mL) was added dropwise to methanol (20.0 mL) at −10° C. and then the solution was stirred at 0° C. for 15 minutes. To the solution was added the oily product obtained previously and the solution was stirred at room temperature for 18 hours. The reaction mixture was concentrated. The obtained residue was dissolved in methylene chloride (20 mL) and thereto was added triethylamine (2.79 mL) at 0° C. Water was added to the reaction solution, which was extracted with methylene chloride. The extract was washed with water, a saturated aqueous sodium hydrogen carbonate solution and brine sequentially, dried over anhydrous magnesium sulfate and concentrated. The residue was purified by column chromatography on silica gel (ethyl acetate:hexane=3:7) to give the title compound (2.56 g) having the following physical data.

1. stirringwas stirred at room temperature for 30 minutes
2. filtrationwas filtrated
3. concentrationThe filtrate was concentrated
4. customto give an oily product
5. stirringthe solution was stirred at 0° C. for 15 minutes
6. additionTo the solution was added the oily product
7. customobtained previously
8. stirringthe solution was stirred at room temperature for 18 hours
9. concentrationThe reaction mixture was concentrated
10. dissolutionThe obtained residue was dissolved in methylene chloride (20 mL)
11. additionwas added triethylamine (2.79 mL) at 0° C
12. additionWater was added to the reaction solution, which
13. extractionwas extracted with methylene chloride
14. washThe extract was washed with water
15. dry with materiala saturated aqueous sodium hydrogen carbonate solution and brine sequentially, dried over anhydrous magnesium sulfate
16. concentrationconcentrated
17. customThe residue was purified by column chromatography on silica gel (ethyl acetate:hexane=3:7)

ORD record

ord-7ba73c494bf7414d8905c8a771800755

Source dataset

uspto-grants-2008_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07402580B2