Iodine → HCID 21471453, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-Ethynyl-2-(4-fluorophenyl)-4-(1-methylethyl)-6-phenylpyridine (700 mg, 2.22 mmol) (the preparation of which is described in Example 14)and AIBN (11 mg) in tri-n-butylstannyl hydride (1.40 ml) was rapidly heated to 120° C. After 5 minutes of heating, the temperature of the reaction was raised to 140° C. and approximately 12 mg of AIBN was added to the reaction mixture every 0.5 hour thereafter. After 2.5 hours, the mixture was cooled to room temperature, diluted with Et2O (20 ml) and treated with solid I2 (2.00 gm, 7.9 mmol). The dark reaction mixture was stirred for one hour, then quenched with 60 ml saturated NaHCO3 containing 4 gm Na2SO3. The layers were shaken and separated. The ethereal layer was washed with brine, dried (Na2SO4), filtered and stripped to yield a yellow oil. The oil was chromatographed twice (Merck SiO2, 5 % EtOAc in hexane (1st) then 3% EtOAc in hexane (2nd)) to (E)-2-(4-Fluorophenyl)-3-(2-iodoethenyl)-4-(1 -methylethyl)-6-phenyl-pyridine as a foam which solidified (671 mg). Recrystallization of the solid from hot hexane gave 482 mg of (E)-2-(4-Fluorophenyl)-3-(2-iodoethenyl)-4-(1-methylethyl)-6-phenyl-pyridine. An additional 100 mg of 2 was obtained from the mother liquor to give a total of 582 mg (59%) product.

Provenance & Evidence