Tetramethoxypropane → Ethyl 8-(3,3,4,4,4-pentafluorobutyl)imidazo[1,5-a]pyrimidine-6-carboxylate
반응식
[NH2:1][C:2]1[NH:6][C:5]([C:7]([O:9][CH2:10][CH3:11])=[O:8])=[N:4][C:3]=1[CH2:12][CH2:13][C:14]([F:20])([F:19])[C:15]([F:18])([F:17])[F:16].CO[CH:23](OC)[CH2:24][CH:25](OC)OC>CCO>[F:19][C:14]([F:20])([C:15]([F:16])([F:17])[F:18])[CH2:13][CH2:12][C:3]1[N:4]=[C:5]([C:7]([O:9][CH2:10][CH3:11])=[O:8])[N:6]2[CH:25]=[CH:24][CH:23]=[N:1][C:2]=12참가 물질
4
실험 절차
A solution of the intermediate from Step C (0.4356 g, 1.446 mmol) and 1,1,3,3-tetramethoxypropane (1.572 mL, 9.54 mmol) in dry EtOH (11.39 mL) was heated by microwave irradiation at 160° C. for 6 h. Another 3.3 eq. 1,1,3,3-tetramethoxypropane was added and the reaction was subjected to microwave irradiation at 160° C. for 6 h. Another 3.3 eq 1,1,3,3-tetramethoxypropane was added and the reaction was subjected to microwave irradiation at 160° C. for 3 h. The reaction mixture was concentrated in vacuo and the resulting crude product was purified by silica gel chromatography using a hexanes/EtOAc gradient to afford the desired product, as a yellow solid. 1H NMR (500 MHz, CHCl3-d) δ 9.48 (dd, J=1.77, 0.4 Hz, 1H); 8.38 (dd, J=3.8, 1.8 Hz, 1H); 6.91 (dd, J=7.3, 3.8 Hz, 1H); 4.53 (q, J=7.1 Hz, 2H); 3.41-3.35 (m, 2H); 2.70-2.56 (m, 2H); 1.48 (t, J=7.1 Hz, 3H). m/z=337.9 (M+H).