Photoaddition Reactions of Acetylpyridines with Silyl Ketene Acetals: SET vs [2 + 2]-Cycloaddition Pathways
作者:Hea Jung Park、Ung Chan Yoon、Hyang-Yeol Lee、Dae Won Cho、Dae Won Cho、Patrick S. Mariano
DOI:10.1021/jo301961n
日期:2012.11.16
Photoaddition reactions of silyl ketene acetals with 2-, 3- and 4-acetylpyridine have been explored. The results show that the acetylpyridines react with an electron rich, dimethyl-substituted silyl ketene acetal via a pathway in which excited state single electron transfer (SET) takes place to produce β-hydroxyesters in high yields. In contrast, photochemical reactions of the acetylpyridines with