[CH:1]#[C:2][CH2:3][CH2:4][CH3:5].I[C:7]1[CH:16]=[CH:15][CH:14]=[CH:13][C:8]=1[C:9]([O:11][CH3:12])=[O:10]>CN(C=O)C.CCN(CC)CC.[Cu]I.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:1]([C:7]1[CH:16]=[CH:15][CH:14]=[CH:13][C:8]=1[C:9]([O:11][CH3:12])=[O:10])#[C:2][CH2:3][CH2:4][CH3:5]Pent-1-yne (5.6 mL, 57.2 mmol) was added to methyl 2-iodobenzoate (5.6 mL, 38.2 mmol), copper(I) iodide (1.0 g, 5.72 mmol) and Pd(PPh3)4 (1.3 g, 1.14 mmol) in DMF (5 mL) and Et3N (1 mL) at RT for 3 hrs. The reaction was partitioned between Et2O and 0.1 M HClaqueous. The resulting organic phase was washed with 0.1 M HClaqueous, NaHCO3aqueous and brine. Organic phase was then anhydrified over Na2SO4 and dried under reduced pressure to give methyl 2-(pent-1-ynyl)benzoate (7.8 g) as a dark oil. The crude will be used in the next step without further purification.
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