Photo-Induced Intermolecular Radical<i>β</i>-Addition to Chiral<i>α</i>-(Arylsulfinyl) Enones
作者:Nobuyuki Mase、Yoshihiko Watanabe、Takeshi Toru
DOI:10.1246/bcsj.71.2957
日期:1998.12
The reactions of α-(arylsulfinyl) enones with alkyl radicals having a hydroxy or acetal group were examined under photo-irradiation in the presence of benzophenone. High diastereoselectivity was observed in the photo-induced radical reaction of 2-(arylsulfinyl)-2-cyclopentenones having a bulky aryl group, such as the 2,4,6-triisopropylphenyl or 2,4,6-trimethylphenyl group. The photo-induced reaction of 3-[(2,4,6-triisopropylphenyl)sulfinyl]-3-pentene-2-one in 1,3-dioxolane also gave a single diastereomer of the 1,3-dioxolan-2-yl adduct.
在二苯甲酮存在下,在光照射下检查了α-(芳基亚磺酰基)烯酮与具有羟基或缩醛基团的烷基的反应。在具有大芳基(例如2,4,6-三异丙基苯基或2,4,6-三甲基苯基)的2-(芳基亚磺酰基)-2-环戊烯酮的光诱导自由基反应中观察到高非对映选择性。 3-[(2,4,6-三异丙基苯基)亚磺酰基]-3-戊烯-2-酮在1,3-二氧戊环中的光诱导反应也产生了1,3-二氧戊环-2-基的单一非对映体加合物。