C1(P(=O)(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.FC(F)(F)S(OS(C(F)(F)F)(=O)=O)(=O)=O.[N:36]1[CH:41]=[CH:40][CH:39]=[CH:38][C:37]=1[C:42](=O)[CH2:43][C:44]1[C:53]2[C:48](=[CH:49][CH:50]=[CH:51][CH:52]=2)[N:47]=[CH:46][CH:45]=1.C(N(CC)CC)C>ClCCCl>[N:36]1[CH:41]=[CH:40][CH:39]=[CH:38][C:37]=1[C:42]#[C:43][C:44]1[C:53]2[C:48](=[CH:49][CH:50]=[CH:51][CH:52]=2)[N:47]=[CH:46][CH:45]=1
A mixture of triphenyphosphine oxide (5.56 g, 10 mmol) in 1,2-dichloroethane (30 mL) is cooled in an ice bath. Trifluoromethanesulfonic anhydride (1.57 mL, 10 mmol) is added dropwise over 15 min. To this mixture is added a solution of 1-(2-pyridyl)-2-(4-quinolyl)ethan-1-one (2.5 g, 10 mmol) in 1,2-dichloroethane (10 mL) and triethylamine (2.84 mL, 20 mmol). The ice bath is removed and the mixture heated at reflux for 16 h. The mixture is diluted with dichloromethane (100 mL) and washed with water (3×100 mL), dried (magnesium sulfate), filtered, concentrated in vacuo, and chromatographed on SiO2 (0 to 100% hexane in ethyl acetate) to yield 1 g of title compound as an oil.
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