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

HRID 1616692Notes

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.I[C:26]1[CH:34]=[CH:33][C:29]([C:30]([OH:32])=[O:31])=[CH:28][CH:27]=1.[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:26]1[CH:34]=[CH:33][C:29]([C:30]([OH:32])=[O:31])=[CH:28][CH:27]=1

Participants

Conditions

Temperature: 50 °C

Procedure

5.4 g (15 mmol) of 1-[5,5,8,8-tetramethyl-4-(2-ethoxyethoxy)-5,6,7,8-tetrahydronaphth-2-yl]prop-2-yn-1-ol and 2.6 g (11 mmol) of 4-iodobenzoic acid are dissolved in 125 mL of DMF and 50 mL of triethylamine. 110 mg of copper iodide and 210 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: 6/4 heptane/EtOAc). The desired product is obtained in the form of yellowish crystals (m=2.5 g; yield=50%; m.p.=158° C.) 1H NMR (DMSO D6): 1.12 (t, J=7.0 Hz, 3H); 1.23 (s, 6H); 1.35 (s, 6H); 1.56-1.60 (m, 4H); 3.50 (q, J=7.0 Hz, 2H); 3.75 (m, 2H); 4.06 (m, 2H); 5.52 (d, J=5.0 Hz, 1H); 6.09 (d, J=4.9 Hz, 1H); 6.90 (s, 1H); 7.11 (s, 1H); 7.54 (d, J=8.3 Hz, 2H); 7.93 (d, J=8.3 Hz, 2H), 13.1 (bs, 1H).

Workup

extractionextracted with ethyl acetate
customThe residue is purified on a column of silica (eluent: 6/4 heptane/EtOAc)

Sources & evidence

ORD record: ord-76939514d5f642ada5527c241a501c38
Source dataset: uspto-grants-2014_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08765805B2

Reaction notes

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