[Br:1][C:2]1[CH:7]=[CH:6][C:5](O)=[C:4]([C:9]([C:11]2[CH:16]=[CH:15][C:14]([CH3:17])=[CH:13][CH:12]=2)=[CH2:10])[CH:3]=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[CH:37]([OH:40])([CH3:39])[CH3:38].CCOC(/N=N/C(OCC)=O)=O>O1CCCC1>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:38][C:37](=[O:40])[CH3:39])=[C:4]([C:9]([C:11]2[CH:16]=[CH:15][C:14]([CH3:17])=[CH:13][CH:12]=2)=[CH2:10])[CH:3]=1To a cold solution (0° C.) of 125 mg (0.4 mmol) of 4-bromo-2-[(1-p-tolyl)vinyl]phenol (Compound R) in 5 mL of tetrahydrofuran was added 125 mg (0.5 mmol) of triphenylphosphine and 0.04 mL (31 mg, 0.5 mmol) of isopropanol followed by 0.07 mL (82 mg, 0.5 mmol) of diethylazodicarboxylate. The dark yellow solution was removed from the ice bath, allowed to warm to ambient temperature on its own and stirred overnight (22.5 hours). The reaction mixture was concentrated in vacuo to a gummy yellow solid. Purification by flash chromatography (silica, 1% ethyl acetate in hexane) gave the title compound as a yellow oil.
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