反应详情

温度

80 °C

To 2-(4,4-dimethyl-2-oxo-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-5-cyano-pyrrole-1-carboxylic acid tert-butyl ester (1.3 g, 35 mmol, 1 eq) in toluene (130 mL) was added Lawesson's reagent (1.58 g, 3.9 mmol, 1.1 eq) and the reaction mixture was heated to 80° C. for 2 h. The solvent was removed in vacuo and the residue was dissolved in acetone/dichloromethane and adsorbed onto silica gel. Purification by flash column chromatography (10% ethyl acetate/hexane) gave the product (0.51 g, 38%) as yellow crystals. 1H NMR (DMSO-d6) δ 1.35 (s, 9H), 1.64 (s, 6H), 6.47 (d, 1H, J=3.6 Hz), 7.07 (d, 1H, J=8.1 Hz), 7.32 (d, 1H, J=3.6 Hz), 7.37 (dd, 1H, J=1.8, 8.1 Hz), 7.43 (d, 1H, J=1.8 Hz), 12.28 (s, 1H); MS (ESI) [M−H]−=382; Anal. Calcd. For C20H21N3O3S: C, 62.64; H, 5.52; N, 10.96. Found: C, 62.53; H, 5.6; N, 10.87.

1. customThe solvent was removed in vacuo
2. dissolutionthe residue was dissolved in acetone/dichloromethane
3. customPurification by flash column chromatography (10% ethyl acetate/hexane)