反应详情

A stirred mixture of 1-bromo-2-difluoromethoxy-4-nitrobenzene (prepared from the corresponding phenol following the procedure outlined in WO9749710A1; 2.68 g, 10 mmol), piperazine (1.12 g, 13 mmol), potassium carbonate (2.07 g, 15 mmol), tetrabutylammonium bromide (0.03 g, 0.1 mmol) and dry dimethyl sulphoxide (20 mL) was heated under nitrogen at 120° C. for 3 h. The product was added to water (100 mL) and 6M hydrochloric acid (10 mL, 60 mmol), washed with ethyl acetate until washings colourless and the aqueous layer basified with 5M sodium hydroxide solution (20 mL, 100 mmol). Extraction with ethyl acetate (3× with 50 mL), drying (sodium sulphate) and evaporating gave product as viscous orange oil.

1. washwashed with ethyl acetate until washings colourless
2. extractionExtraction with ethyl acetate (3× with 50 mL)
3. dry with materialdrying (sodium sulphate)
4. customevaporating
5. customgave product as viscous orange oil