反应详情

Following the general nucleophilic carbamoylation procedure, tranexamic acid (472 mg, 3.0 mmol) and 1-[(2,5-dioxopyrrolidinyl)oxycarbonyloxy]-2-methylpropyl 2-methylpropanoate (603 mg, 2.0 mmol) were reacted in the MTBE/acetone/water mixture (16 mL) to yield the title compound 44 (486 mg, 71% yield) as a white powder after work-up and mass-guided preparative HPLC purification. 1H NMR (400 MHz, DMSO-d6): δ =0.82-0.94 (br. m, 8H), 1.06 (d, J=6.8 Hz, 3H), 1.08 (d, J=7.2 Hz, 3H), 1.16-1.38 (br. m, 3H), 1.64-1.73 (br. m, 2H), 1.82-1.92 (br. m, 3H), 2.10 (tt, J=12.0, 3.6 Hz, 1H), 2.52 (hept., J=6.8 Hz, 1H), 2.74-2.87 (br. m, 2H), 6.42 (d, J=5.2 Hz, 1H), 7.40 (t, J=6.0 Hz, 1H), 11.97 (br. s, 1H). MS (ESI) m/z 366.08 (M+Na)+; 342.04 (M−H)−.