Triphenylphosphine → (+/-)-4-{1-[3,5-Difluoro-4-(4-trifluoromethyl-pyrazol-1-yl)-phenoxy]-butyl}-benzoic acid ethyl ester

HRID 537588Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 537588
[F:1][C:2]1[CH:3]=[C:4]([OH:18])[CH:5]=[C:6]([F:17])[C:7]=1[N:8]1[CH:12]=[C:11]([C:13]([F:16])([F:15])[F:14])[CH:10]=[N:9]1.O[CH:20]([C:24]1[CH:34]=[CH:33][C:27]([C:28]([O:30][CH2:31][CH3:32])=[O:29])=[CH:26][CH:25]=1)[CH2:21][CH2:22][CH3:23].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCCC=[N+]=[N-])=O)=NC([O-])=O>O1CCCC1>[CH2:31]([O:30][C:28](=[O:29])[C:27]1[CH:33]=[CH:34][C:24]([CH:20]([O:18][C:4]2[CH:5]=[C:6]([F:17])[C:7]([N:8]3[CH:12]=[C:11]([C:13]([F:15])([F:16])[F:14])[CH:10]=[N:9]3)=[C:2]([F:1])[CH:3]=2)[CH2:21][CH2:22][CH3:23])=[CH:25][CH:26]=1)[CH3:32]

Komponenten

6

Edukt 4

HCID 11776TriphenylphosphineHCID 67981039Ethyl 4-(1-hydroxybutyl)benzoate2×HCID 681573243,5-Difluoro-4-(4-trifluoromethyl-pyrazol-1-yl)-phenolHCID 86669100Diazopropyl azodicarboxylate

Produkt 1

HCID 68178668(+/-)-4-{1-[3,5-Difluoro-4-(4-trifluoromethyl-pyrazol-1-yl)-phenoxy]-butyl}-benzoic acid ethyl esterAusbeute 100,7 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

3,5-Difluoro-4-(4-trifluoromethyl-pyrazol-1-yl)-phenol (230 mg, 0.871 mmol) was combined with ethyl 4-(1-hydroxybutyl)benzoate (see Intermediate 5) (194 mg, 0.871 mmol) and dissolved in anhydrous tetrahydrofuran (4 mL). Triphenylphosphine (457 mg, 1.74 mmol) was added followed by diazopropyl azodicarboxylate (0.451 mL, 2.18 mmol). This was stirred at room temperature as a yellow solution. At 17 h. the reaction was concentrated. Purification by silica gel flash chromatography (ethyl acetate in heptane) gave impure (+/−)-4-{1-[3,5-difluoro-4-(4-trifluoromethyl-pyrazol-1-yl)-phenoxy]-butyl}-benzoic acid ethyl ester (0.411 g) as a clear oil. 1H NMR (400 MHz, CDCl3, δ): 8.06 (d, J=8.2 Hz, 2H) 7.93 (s, 1H) 7.82 (s, 1H) 7.39 (d, J=8.4 Hz, 2H) 6.54 (d, J=9.4 Hz, 2H) 5.15 (dd, J=7.6, 5.3 Hz, 1H) 4.39 (q, J=7.2 Hz, 2H) 1.96-2.10 (m, 1H) 1.77-1.91 (m, 1H) 1.19-1.61 (m, 5H) 0.98 (t, J=7.3 Hz, 3H); MS (M+1): 469.3.

Aufarbeitung

  1. concentrationAt 17 h. the reaction was concentrated
  2. customPurification by silica gel flash chromatography (ethyl acetate in heptane)

Quellen und Nachweise

ORD-Eintrag
ord-336d9f136c08470dbbb466818319aa27
Quelldatensatz
uspto-grants-2014_10
Patentnummer
US08859591B2

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