反应详情

温度

120 °C

A flask was charged under nitrogen with methyl 3-bromo-5-nitrobenzoate (D11) (136 mg, 0.52 mmol, 1,1 equiv), Cs2CO3 (216 mg, 0.66 mmol, 1.4 equiv), tris(dibenzylideneacetone)dipalladium(0) (22 mg, 0.023 mmol, 0.05 equiv), Xantphos (27 mg, 0.047 mmol, 0.1 equiv) and toluene (10 ml). 4-phenyltetrahydro-2H-1,2-thiazine 1,1-dioxide (J. Morris, D. G. Wishka J. Org. Chem. 1991, 56, 3549-3556, 100 mg, 0.47 mmol, 1 equiv) was then added and the resulting mixture was stirred at 120° C. for 5 h then cooled to room temperature and concentrated in vacuo. The residue was partitioned between H2O and AcOEt and the aqueous phase was re-extracted with AcOEt. The combined organic solutions were dried over MgSO4 and concentrated in vacuo. Purification of the residue by flash chromatography on silica gel (iso-hexane/AcOEt: 7/3) gave methyl 3-(1,1-dioxido-4-phenyltetrahydro-2H-1,2-thiazin-2-yl)-5-nitrobenzoate (B123) (110 mg, 60%) as a yellow oil. [M+H+ NH3]+=408.3, RT=3.24 min

1. temperaturethen cooled to room temperature
2. concentrationconcentrated in vacuo
3. customThe residue was partitioned between H2O and AcOEt
4. extractionthe aqueous phase was re-extracted with AcOEt
5. dry with materialThe combined organic solutions were dried over MgSO4
6. concentrationconcentrated in vacuo
7. customPurification of the residue by flash chromatography on silica gel (iso-hexane/AcOEt: 7/3)