Ammonium Chloride → (E)-tert-butyl 2-(6-benzamidohex-2-enamido)phenylcarbamate

Participants

Reaction Steps

To a solution of (E)-tert-butyl 2-(6-benzamidohex-3-enamido)phenylcarbamate (423 mg, 1 mmol) in MeOH was added MeONa (37 mg, 20 mmol), the mixture was stirred for 12 hours. To the reaction mixture was added sat. NH4Cl solution to adjust the pH value to 7-8, then concentrated, the residue was dissolved in DCM, the organic layer was washed with brine, dried over Na2SO4 and concentrated to give the desired compound of (E)-tert-butyl 2-(6-benzamidohex-2-enamido)phenylcarbamate (14) (270 mg, 64%) and (E)-tert-butyl 2-(6-benzamidohex-3-enamido)phenylcarbamate (15) (123 mg, 28%) as white solids after purification by column chromatography (eluent: DCM:MeOH=100:1). LC-MS found 424 (M+H)+. Analytical data for compound 14: 1H NMR (300 MHz, DMSO): δ 1.504 (s, 9H), 1.791 (m, 2H), 2.308 (m, 2H), 3.465 (m, 2H), 5.988 (d, J=15.6 Hz, 1H), 6.146 (s, 1H), 6.897-6.984 (m, 3H), 7.141-7.165 (m, 2H), 7.418 (s, 1H). 7.515 (s, 1H), 7.4585 (d, 2H). 8.133 (s, 1H).

Provenance & Evidence