反应详情

To a solution of (E)-tert-butyl 2-(6-benzamidohex-3-enamido)phenylcarbamate (15)(130 mg, 0.307 mmol) in propan-2-ol (10 mL) was bubbled HCl gas for 1 hour at 0° C. To the reaction mixture was added 10% K2CO3 to adjust the pH value to 7-8, then the mixture was extracted with DCM (3×50 mL), the combined organic layers were washed with brine, dried over Na2SO4 and concentrated to give the desired compound of (E)-N-(6-(2-aminophenylamino)-6-oxohex-3-enyl)benzamide (16) (20 mg, 20%) as an off-white solid after purification by column chromatography (eluent: DCM:MeOH=50:1). 1H NMR (300 MHz, DMSO): δ 2.418 (m, 2H), 3.257 (m, 2H), 4.847 (s, 2H), 5.572-5.716 (m, 2H), 6.519-6.570 (m, 1H), 67.424-7.549 (m, 3H), 7.833-7.861 (t, 2H). 8.532-8.576 (t, 2H), 9.149 (s, 1H); LC-MS found 324 (M+H)+; HPLC (214 nm, 98%, 254 nm, 98%).

1. extractionthe mixture was extracted with DCM (3×50 mL)
2. washthe combined organic layers were washed with brine
3. dry with materialdried over Na2SO4
4. concentrationconcentrated