Table 3. Photochemical-Catalyzed Protection of Alcohols 4a–m.^a.

^aConditions: a solution containing the alcohol 4a–m (5 mmol, 1 equiv), a vinyl ether 5a,b (5.5 mmol, 1.1 equiv), and 1e (0.5 mol %) in 4 mL of MeCN was irradiated under air-equilibrated conditions with one 40 W Kessil lamp (emission centered at 456 nm). Isolated yield shown.

^bReaction carried out on 25 mmol scale.

^cUpon 2 h sunlight exposure.

^dYield determined by GC analysis.