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

HRID 385343Notes

Reaction equation

HRID 385343 reaction equation
[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]

Participants

6

Reactant 4

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

Product 1

HCID 579956202-(4-Cyclopropylmethoxy-3-nitro-5-trifluoromethyl-phenyl)-4-methyl-pentanoic acid ethyl esterYield 61.5%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

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.

Workup

  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

Sources & evidence

ORD record
ord-c6778d4f1e0f429ea3721fcc20183bd1
Source dataset
uspto-grants-2013_02
Patent number
US08367863B2

Reaction notes

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