Ammonium Chloride → 4-{3-Hydroxy-3-[4-(2-ethoxyethoxy)-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphth-2-yl]prop-1-ynyl}-2-hydroxybenzoic acid

HRID 498938Notes

Reaction equation

[CH3:1][C:2]1([CH3:24])[CH2:11][CH2:10][C:9]([CH3:13])([CH3:12])[C:8]2[CH:7]=[C:6]([CH:14]([OH:17])[C:15]#[CH:16])[CH:5]=[C:4]([O:18][CH2:19][CH2:20][O:21][CH2:22][CH3:23])[C:3]1=2.[OH:25][C:26]1[CH:34]=[C:33](I)[CH:32]=[CH:31][C:27]=1[C:28]([OH:30])=[O:29].[Cl-].[NH4+]>CN(C=O)C.C(N(CC)CC)C.[Cu](I)I>[OH:17][CH:14]([C:6]1[CH:5]=[C:4]([O:18][CH2:19][CH2:20][O:21][CH2:22][CH3:23])[C:3]2[C:2]([CH3:24])([CH3:1])[CH2:11][CH2:10][C:9]([CH3:12])([CH3:13])[C:8]=2[CH:7]=1)[C:15]#[C:16][C:33]1[CH:32]=[CH:31][C:27]([C:28]([OH:30])=[O:29])=[C:26]([OH:25])[CH:34]=1

Participants

Conditions

Temperature: 50 °C

Procedure

200 mg (0.6 mmol) of 1-[5,5,8,8-tetramethyl-4-(2-ethoxyethoxy)-5,6,7,8-tetrahydronaphth-2-yl]prop-2-yn-1-ol (Example 2b) and 175 mg (0.4 mmol) of 2-hydroxy-4-iodobenzoic acid are dissolved in 5 mL of DMF and 2 mL of triethylamine. 10 mg of copper iodide and 20 mg of dichloropalladiumbis(triphenylphosphine) are added, and the reaction medium is stirred at 50° C. for 2 hours 30 minutes. The reaction medium is poured into ammonium chloride solution and extracted with ethyl acetate. The residue is purified on a column of silica (eluent: 5/5 heptane/EtOAc). The desired product is obtained in the form of a yellowish powder (m=80 mg; yield=42%; m.p.=120° C.) 1H NMR (DMSO D6): 1.13 (t, J=7.0 Hz, 3H); 1.24 (s, 6H); 1.36 (s, 6H); 1.56-1.61 (m, 4H); 3.52 (q, J=7.0 Hz, 2H); 3.76 (m, 2H); 4.07 (m, 2H); 5.51 (s, 1H); 6.15 (bs, 1H); 6.89 (s, 1H); 6.97 (m, 2H); 7.11 (s, 1H); 7.77-7.79 (m, 1H), 11.5 (bs, 1H).

Workup

extractionextracted with ethyl acetate
customThe residue is purified on a column of silica (eluent: 5/5 heptane/EtOAc)

Sources & evidence

ORD record: ord-766d81ae2691427b8eecda581bc94538
Source dataset: uspto-grants-2010_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07767650B2

Reaction notes

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