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 1929957Notes

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-e51c3ebf30a64f7fa51d191d73f0c9d8
Source dataset: uspto-grants-2012_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08188106B2

Reaction notes

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