反应详情

A mixture of Example 35B (2.24 g, 12.9 mmol), 1-(1-isocyanoethylsulfonyl)-4-methylbenzene (2.71 g, 12.9 mmol), and K2CO3 (2.15 g, 15.5 mmol) in MeOH (60 mL) was heated at reflux for 2 hr. The reaction was cooled to ambient temperature, and the volatiles removed at reduced pressure. The residue was partitioned between H2O and Et2O. The separated aqueous phase was extracted with Et2O, and the combined organic layer was washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo. Flash chromatography (Analogix® Intelliflash 280™; 15% to 40% EtOAc/hexanes eluant; SF40-150 g column) yielded 2.35 g (80%) of the title compound as a colorless oil. 1H NMR (300 MHz, DMSO-d6) δ 8.35 (s, 1H), 7.71-7.61 (m, 4H), 2.37 (s, 3H), 1.71 (s, 6H). MS (DCI+) m/z 227 (M+H).

1. temperatureat reflux for 2 hr
2. customthe volatiles removed at reduced pressure
3. customThe residue was partitioned between H2O and Et2O
4. extractionThe separated aqueous phase was extracted with Et2O
5. washthe combined organic layer was washed with brine
6. dry with materialdried (Na2SO4)
7. filtrationfiltered
8. concentrationconcentrated in vacuo