反应详情

温度

65 °C

To a solution of 4-Azido-9-bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester (280 mg, 0.735 mmol) in THF/water (15 mL/3 mL) was added PPh3 (192.5 mg, 0.735 mmol). The reaction mixture was heated to 65° C. overnight. The mixture was cooled to −5° C., and TEA (222 mg, 2.200 mmol) was added followed by acetyl chloride (86.5 mg, 1.101 mmol). Then the mixture was stirred at room temperature for 1 h. The mixture was partitioned between EtOAc and H2O, and the aqueous layer was extracted with EtOAc (2×20 mL). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated to afford crude product which was triturated with EtOAc and hexane (1:1) and then filtered to afford 4-Acetylamino-9-bromo-4,5-dihydro-6-oxa-3-thia-1-aza-benzo[e]azulene-2-carboxylic acid methyl ester (160 mg, 51%). 1H NMR (400 MHz, DMSO-d6): δ 8.80 (d, J=2.5 Hz, 1H), 8.48 (s, 1H), 7.53 (dd, J1=8.7 Hz, J2=2.6 MHz, 1H), 7.13 (d, J=8.6 Hz, 2H), 5.51 (m, 1H), 4.41 (m, 1H), 4.23 (m, 1H), 3.96 (s, 3H), 1.90 (s, 3H); LC-MS (ESI & APCI): 399.1 (M+2).

1. temperatureThe mixture was cooled to −5° C.
2. customThe mixture was partitioned between EtOAc and H2O
3. extractionthe aqueous layer was extracted with EtOAc (2×20 mL)
4. washThe combined organic layers were washed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customto afford crude product which
9. customwas triturated with EtOAc and hexane (1:1)
10. filtrationfiltered