反应详情

温度

75 °C

A mixture of 7-bromo-3-chloro-5H-chromeno[2,3-c]pyridin-5-one (5.0 g, 48.3 mmol), (R)-2-methylpropane-2-sulfinamide (5.85 g, 48.3 mmol), and tetraethoxytitanium (10.00 mL, 48.3 mmol) in dry THF (100 mL) was heated at 75° C. for 24 hours. The solution was cooled to RT and slowly poured into a 2 L flask containing 0.35 L of brine and 0.35 L of saturated sodium bicarbonate. The resulting mixture was stirred vigorously for 15 minutes before being filtered through a pad of celite. The pad was washed with EtOAc. The filtrate was poured into a separatory funnel and the aqueous layer was extracted with EtOAc (2×500 mL). The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated in vacuo to provide an orange solid. This solid was purified by silica gel chromatography using 0-15% Hexane/EtOAC to provide (R,E)-N-(7-bromo-3-chloro-5H-chromeno[2,3-c]pyridin-5-ylidene)-2-methylpropane-2-sulfinamide as an orange solid. M+H=415.0@2.90 min.

1. temperatureThe solution was cooled to RT
2. additionslowly poured into a 2 L flask
3. filtrationbefore being filtered through a pad of celite
4. washThe pad was washed with EtOAc
5. additionThe filtrate was poured into a separatory funnel
6. extractionthe aqueous layer was extracted with EtOAc (2×500 mL)
7. washThe combined organic layers were washed with brine
8. dry with materialdried over sodium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. customto provide an orange solid
12. customThis solid was purified by silica gel chromatography