Tetrabutylammonium Fluoride → 3-Chlorophenylurea
反応式
C(C1C=C([NH:10][C:11]([NH:13][C:14]2[CH:19]=[CH:18][CH:17]=[C:16]([Cl:20])[CH:15]=2)=[O:12])N(C2C=CC=C(CO[Si](C(C)(C)C)(C)C)C=2)N=1)(C)(C)C.CCCC[N+](CCCC)(CCCC)CCCC.[F-]>C1COCC1>[Cl:20][C:16]1[CH:15]=[C:14]([NH:13][C:11](=[O:12])[NH2:10])[CH:19]=[CH:18][CH:17]=1参加物
4
実験手順
To a solution of 1-(3-t-butyl-1-{3-[(t-butyldimethylsilyloxy)methyl]phenyl}-1H-pyrazol-5-yl)-3-(3-chlorophenyl)urea (120 mg, 0.12 mmol) in THF (2 mL) was added TBAF (1.0 M, 0.13 mL, 0.13 mmol). The reaction mixture was stirred at RT for 2.5 h. The solvent was removed under reduced pressure. EtOAc was added into the residue followed by 1N—HCl (5 drops). The combined organic extracts were washed with brine, dried (Na2SO4), filtered, concentrated and purified via column chromatography to yield 1-(3-t-butyl-1-(3-hydroxymethyl)phenyl)-1H-pyrazol-5-yl)-3-(3-chlorophenyl)urea as a white powder (34 mg, 71% yield). 1H-NMR (CDCl3): δ 8.11 (s, 1H), 7.34 (t, J=2.0 Hz, 1H), 7.05-7.25 (m, 7H), 6.99 (dt, J=1.3, and 7.8 Hz, 1H), 6.39 (s, 1H), 4.39 (s, 2H), 1.33 (s, 9H); MS (EI) m/z: 399 (M+H+).