反应详情

A round bottom flask was charged with perfluorophenyl 4-(2-bromo-4-(trifluoromethyl)phenyl)-3,4-dihydro-2H-benzo[b][1,4]oxazine-7-sulfonate (see EXAMPLE 46, STEP 1) (391 mg, 0.647 mmol), dicyanozinc (380 mg, 3.24 mmol), and palladum (0) bis(tri-tert-butylphosphine) (33.1 mg, 0.065 mmol). The flask was flushed with Ar (g), then DMAC (3235 μL) was added. A reflux condenser was attached, and the flask was lowered into a 60° C. heating bath overnight. The mixture was cooled to room temperature and diluted with water and EtOAc. A small portion of brine was added to break up an emulsion, and the layers were separated. The aq. layer was extracted with EtOAc (2×), and the combined organic extracts were dried over sodium sulfate, filtered, and concentrated. The product was purified by chromatography on silica gel (40 g, 0 to 30% EtOAc/Heptane) to give perfluorophenyl 4-(2-cyano-4-(trifluoromethyl)phenyl)-3,4-dihydro-2H-benzo[b][1,4]oxazine-7-sulfonate (327 mg, 0.594 mmol) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.50 (d, J=2.2 Hz, 1 H), 8.26-8.13 (m, 1 H), 7.85 (d, J=8.5 Hz, 1 H), 7.43 (d, J=2.2 Hz, 1 H), 7.33 (dd, J=2.3, 8.8 Hz, 1 H), 6.80 (d, J=8.8 Hz, 1 H), 4.45-4.40 (m, 2 H), 3.94 (t, J=4.2 Hz, 2 H). m/z (ESI) 573.2 (M+H)+.

1. customThe flask was flushed with Ar (g)
2. additionDMAC (3235 μL) was added
3. customA reflux condenser was attached
4. customwas lowered into a 60° C.
5. temperatureheating bath overnight
6. additiondiluted with water and EtOAc
7. additionA small portion of brine was added
8. customthe layers were separated
9. extractionThe aq. layer was extracted with EtOAc (2×)
10. dry with materialthe combined organic extracts were dried over sodium sulfate
11. filtrationfiltered
12. concentrationconcentrated
13. customThe product was purified by chromatography on silica gel (40 g, 0 to 30% EtOAc/Heptane)