1-(tert-Butoxycarbonyl)-2-pyrroleboronic Acid → 2-(3,4,5-trimethoxyphenylamino)-6-(N-tert-butoxycarbonyl-pyrrol-2-yl) pyrazine
반응식
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([NH:13][C:14]2[CH:19]=[N:18][CH:17]=[C:16](Cl)[N:15]=2)[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10].[C:21]([O:25][C:26]([N:28]1[CH:32]=[CH:31][CH:30]=[C:29]1B(O)O)=[O:27])([CH3:24])([CH3:23])[CH3:22]>>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([NH:13][C:14]2[CH:19]=[N:18][CH:17]=[C:16]([C:29]3[N:28]([C:26]([O:25][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:27])[CH:32]=[CH:31][CH:30]=3)[N:15]=2)[CH:6]=[C:7]([O:11][CH3:12])[C:8]=1[O:9][CH3:10]참가 물질
3
실험 절차
Using Method C with 100 mg (0.34 mmol) 2a and 86 mg (0.41 mmol) 1-tert-butoxycarbonyl-2-pyrrolyl boronic acid, 6 mg pure title compound were obtained. The filtrate was submitted to purification by preparative HPLC (eluent:AcOEt) and a fraction of 52 mg of a product containing 25% (LC-MS) of the desired compound was obtained. A second purification using a semi-preparative Supelco discovery C18 column (250×10 mm) (eluent: acetonitrile:H2O 9:1) led to 6 mg (4.1%) of pure title compound. Reaction time: 18 hours. 1H-NMR (DMSO), δ (ppm), J (Hz): 1.25 (s, 9H, t-Bu), 3.60 (s, 3H, CH3O(4′)), 3.72 (s, 6H, CH3O(3′+5′)), 6.33 (t, 1H, Hpyr 4′, J=3.30), 6.58-6.60 (m, 1H, Hpyr 3′ or 5′), 7.16 (s, 2H, Harom(2+6)), 7.42-7.44 (m, 1H, Hpyr 5′ or 3′), 8.04 (s, 1H, HP5), 8.12 (s, 1H, HP3), 9.53 (s, 1H, NHamine); MS, (C22H16N4O5), m/z: 427 [M++1, 100].