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Triphenylphosphine → 2-(4-Cyclopropylmethoxy-3-nitro-5-trifluoromethyl-phenyl)-4-methyl-pentanoic acid ethyl ester

HRID 385343
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Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 385343
[CH2:1]([O:3][C:4](=[O:24])[CH:5]([C:10]1[CH:15]=[C:14]([C:16]([F:19])([F:18])[F:17])[C:13]([OH:20])=[C:12]([N+:21]([O-:23])=[O:22])[CH:11]=1)[CH2:6][CH:7]([CH3:9])[CH3:8])[CH3:2].[CH:25]1([CH2:28]O)[CH2:27][CH2:26]1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O>C1COCC1>[CH2:1]([O:3][C:4](=[O:24])[CH:5]([C:10]1[CH:15]=[C:14]([C:16]([F:18])([F:19])[F:17])[C:13]([O:20][CH2:28][CH:25]2[CH2:27][CH2:26]2)=[C:12]([N+:21]([O-:23])=[O:22])[CH:11]=1)[CH2:6][CH:7]([CH3:9])[CH3:8])[CH3:2]
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Komponenten

6

Edukt 4

HCID 11776TriphenylphosphineHCID 75644CyclopropanemethanolHCID 220568ethyl N-ethoxycarbonyliminocarbamateHCID 579955452-(4-Hydroxy-3-nitro-5-trifluoromethyl-phenyl)-4-methyl-pentanoic acid ethyl ester

Produkt 1

HCID 579956202-(4-Cyclopropylmethoxy-3-nitro-5-trifluoromethyl-phenyl)-4-methyl-pentanoic acid ethyl ester
Ausbeute 61,5 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel

Versuchsvorschrift

To a solution of 2-(4-hydroxy-3-nitro-5-trifluoromethyl-phenyl)-4-methyl-pentanoic acid ethyl ester (2.66 g, 7.62 mmol), cyclopropanemethanol (0.60 g, 8.38 mmol) and triphenylphosphine (2.40 g, 9.14 mmol) in anhydrous THF (32 mL) was added diethyl azodicarboxylate (40 wt % solution in toluene, 3.98 g, 9.14 mmol) dropwise. The reaction mixture was stirred at room temperature for two days and then concentrated under reduced pressure. The residue was triturated with THF/hexane (1:5, 3×15 mL). The combined extracts were concentrated under reduced pressure to give a yellow solid, which was purified by silica-gel flash chromatography eluting with heptane/ethyl acetate (60:1 and then 10:1) to give 2-(4-cyclopropylmethoxy-3-nitro-5-trifluoromethyl-phenyl)-4-methyl-pentanoic acid ethyl ester (1.89 g, 61%) as a colorless oil: 1H NMR (300 MHz, CDCl3): δ 7.92 (s, 1H), 7.73 (s, 1H), 4.06 (m, 2H), 3.79 (d, 2H, J=7.2 Hz), 3.64 (t, 1H, J=7.5 Hz), 1.93 (m, 1H), 1.55 (m, 1H), 1.40 (m, 1H), 1.24 (m, 1H), 1.17 (t, 3H, J=6.9 Hz), 0.86 (m, 6H), 0.56 (d, 2H, J=6.6 Hz), 0.27 (m, 2H); 13C NMR (75 MHz, CDCl3): δ 172.49, 149.98, 144.40, 135.55, 130.96 (q, J=5 Hz), 128.29, 126.77, (q, J=31 Hz), 122.37 (q, J=272 Hz), 82.03, 61.37, 48.74, 42.66, 26.04, 22.36, 22.32, 14.14, 10.66, 3.39.

Aufarbeitung

  1. concentrationconcentrated under reduced pressure
  2. customThe residue was triturated with THF/hexane (1:5, 3×15 mL)
  3. concentrationThe combined extracts were concentrated under reduced pressure
  4. customto give a yellow solid, which
  5. customwas purified by silica-gel flash chromatography
  6. washeluting with heptane/ethyl acetate (60:1

Quellen und Nachweise

ORD-Eintrag
ord-c6778d4f1e0f429ea3721fcc20183bd1
Quelldatensatz
uspto-grants-2013_02
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US08367863B2

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