4-Bromothioanisole → HCID 18788503, compound

Temperature

0 °C

To a -78° C. solution of 4-bromothioanisole (35.1 g, 173 mmol) in THF (500 mL) was added nBuLi (1.6M in hexanes, 107.5 mL, 172 mmol). The solution was stirred for 45 min, then a solution of 2-bromo-2-cyclopenten-1-one (25.4 g, 158 mmol) in THF (150 mL) was added and the mixture was allowed to warm to 0° C. and was quenched with saturated aqueous NH4Cl. The majority of the solvent was removed in vacuo and the residue was suspended in water and extracted with two portions of EtOAc. The organic layers were washed with brine, dried over MgSO4, filtered and concentrated. This material was dissolved in DMF (300 mL), cooled to 0° C. and treated with PDC (72.4 g, 192 mmol). The resulting mixture was warmed to r.t. and stirred for 2 h, then poured into H2O (1.2 L) and extracted with two 500 mL portions of EtOAc. The organic layers were washed with brine, dried over MgSO4, filtered and concentrated to give the title compound as a light brown solid which was used directly in the next step.

1. customwas quenched with saturated aqueous NH4Cl
2. customThe majority of the solvent was removed in vacuo
3. extractionextracted with two portions of EtOAc
4. washThe organic layers were washed with brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. dissolutionThis material was dissolved in DMF (300 mL)
9. temperaturecooled to 0° C.
10. temperatureThe resulting mixture was warmed to r.t.
11. stirringstirred for 2 h
12. extractionextracted with two 500 mL portions of EtOAc
13. washThe organic layers were washed with brine
14. dry with materialdried over MgSO4
15. filtrationfiltered
16. concentrationconcentrated

ORD record

ord-13b3f848a8f3483ba5b3c9e26116f886

Source dataset

uspto-grants-1999_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05922742