p-(Trifluoromethoxy)benzaldehyde → 4-[5-(4-Trifluoromethoxyphenyl)-[1,2,4]oxadiazol-3-yl]phenylamine

HRID 1424734

Reaction equation

HRID 1424734 reaction equation
C(OC(=O)[NH:7][C:8]1[CH:13]=[CH:12][C:11]([C:14]2[N:18]=[C:17]([C:19]3[CH:24]=[CH:23][C:22]([O:25][C:26]([F:29])([F:28])[F:27])=[CH:21][CH:20]=3)[O:16][N:15]=2)=[CH:10][CH:9]=1)(C)(C)C.C(OC(=O)NC1C=CC(C(=N)NO)=CC=1)(C)(C)C.FC(F)(F)OC1C=CC(C=O)=CC=1>C(O)(=O)C.C(Cl)(Cl)Cl>[F:29][C:26]([F:27])([F:28])[O:25][C:22]1[CH:21]=[CH:20][C:19]([C:17]2[O:16][N:15]=[C:14]([C:11]3[CH:12]=[CH:13][C:8]([NH2:7])=[CH:9][CH:10]=3)[N:18]=2)=[CH:24][CH:23]=1

Participants

6

Reactant 3

HCID 69573p-(Trifluoromethoxy)benzaldehydeHCID 66968928{4-[5-(4-Trifluoromethoxyphenyl)-[1,2,4]oxadiazol-3-yl]-phenyl}-carbamic acid tert-butyl esterHCID 178452743HCID 178452743, compound

Product 1

HCID 578245054-[5-(4-Trifluoromethoxyphenyl)-[1,2,4]oxadiazol-3-yl]phenylamineYield 15%

Reagents, catalysts & solvents 2

HCID 176Acetic AcidSolventHCID 6212ChloroformSolvent

Procedure

{4-[5-(4-Trifluoromethoxyphenyl)-[1,2,4]oxadiazol-3-yl]-phenyl}-carbamic acid tert-butyl ester. To a stirred solution of tert-butyl-4-(N-hydroxycarbamimidoyl)-phenylcarbamate (Ace Synthesis) (500 mg, 1.99 mmol) dissolved in acetic acid (2.5 mL) was added 4-trifluoromethoxybenzaldehyde (1.7 mL, 11.94 mmol), and the reaction mixture was stirred at room temperature for 4 d. The mixture was diluted with CHCl3 (20 mL) and filtered through a pad of Celite®. The pad was washed with CHCl3 (20 mL). Heptane (20 mL) was then added to the solution and the solution was concentrated under reduced pressure. This procedure was repeated twice. The residue was purified via radial chromatography using a 3:1 hexane/EtOAc solution as the eluent. Two fractions were isolated. The first fraction isolated (Rf=0.42) was shown to be the title compound (127 mg, 15%): 1H NMR (300 MHz, CDCl3) 8.26 (d, J=8.9 Hz, 2H), 8.09 (d, J=8.9 Hz, 2H), 7.52 (d, J=8.6 Hz, 2H), 7.39 (d, J=8.3 Hz, 2H), 6.70 (s, 1H), 1.54 (s, 9H); EIMS 421 (M+). The second fraction isolated (Rf=0.11) was shown to be the 4,5-dihydro-1,2,4-oxadiazole (96 mg; 11%). 1H NMR (300 MHz, CDCl3) δ 8.40 (d, J=8.9 Hz, 2H), 8.00 (d, J=8.9 Hz, 2H), 7.51 (d, J=8.9 Hz, 2H), 7.22-7.31 (m, 3H), 6.87 (s, 1H), 1.54 (s, 9H); EIMS m/z 423 (M+).

Workup

  1. filtrationfiltered through a pad of Celite®
  2. washThe pad was washed with CHCl3 (20 mL)
  3. additionHeptane (20 mL) was then added to the solution
  4. concentrationthe solution was concentrated under reduced pressure
  5. customThe residue was purified via radial chromatography
  6. customTwo fractions were isolated
  7. customThe first fraction isolated (Rf=0.42)

Sources & evidence

ORD record
ord-4ca57f14e0364c689aeffc757ae3cdb1
Source dataset
uspto-grants-2015_01
Patent number
US08927729B2

Linked notes

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