Trimethylsilylacetylene → Methyl 4-cyclobutyl-2-methyl-5-((trimethylsilyl)ethynyl)benzoate

HRID 541454Notes

Reaction equation

[CH:1]1([C:5]2[C:14](I)=[CH:13][C:8]([C:9]([O:11][CH3:12])=[O:10])=[C:7]([CH3:16])[CH:6]=2)[CH2:4][CH2:3][CH2:2]1.[CH3:17][Si:18]([C:21]#[CH:22])([CH3:20])[CH3:19]>C1COCC1.C(N(CC)CC)C.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[Cu](I)I>[CH:1]1([C:5]2[C:14]([C:22]#[C:21][Si:18]([CH3:20])([CH3:19])[CH3:17])=[CH:13][C:8]([C:9]([O:11][CH3:12])=[O:10])=[C:7]([CH3:16])[CH:6]=2)[CH2:4][CH2:3][CH2:2]1

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of methyl 4-cyclobutyl-5-iodo-2-methylbenzoate (compound 152.3, 1.32 g, 4 mmol), trimethylsilylacetylene (663 μl, 4.8 mmol), Pd(PPh3)2Cl2 (85 mg, 0.12 mmol) and copper iodide (CuI, 46 mg, 0.24 mmol) in THF (8 ml) and triethylamine (2 ml) was degassed and then heated to 80° C. for 1.5 hours under nitrogen. After cooling to ambient temperature, the reaction was filtered through celite and concentrated. The residue was dissolved in ethyl acetate (EtOAc), washed with brine, dried over MgSO4 and concentrated. The residue was purified by flash chromatography (SiO2; 3% EtOAc in Hexane) to give 1.17 g (97%) of the title compound as a liquid. 1H NMR (400 MHz, CDCl3) δ 8.01 (s, 1H), 7.15 (s, 1H), 4.01-3.75 (m, 4H), 2.63 (s, 3H), 2.54-2.31 (m, 2H), 2.27-2.12 (m, 2H), 2.12-1.98 (m, 1H), 1.94-1.80 (m, 1H), 0.28 (s, 9H).

Workup

customwas degassed
temperatureAfter cooling to ambient temperature
filtrationthe reaction was filtered through celite
concentrationconcentrated
dissolutionThe residue was dissolved in ethyl acetate (EtOAc)
washwashed with brine
dry with materialdried over MgSO4
concentrationconcentrated
customThe residue was purified by flash chromatography (SiO2; 3% EtOAc in Hexane)

Sources & evidence

ORD record: ord-34dda24bb5a447dabfc2160f5882ec0e
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08871790B2

Reaction notes

Loading…