Cycloaddition reactions of 4-sulfur-substituted dihydro-2-pyridones and 2-pyridones with conjugated dienes
作者:Shang-Shing P. Chou、Pong-Won Chen
DOI:10.1016/j.tet.2007.11.090
日期:2008.2
Cycloaddition reactions of sulfoxide- and sulfone-substituted dihydro-2-pyridones and 2-pyridones with electron-rich dienes gave new bicyclic and tricyclic products in good to fair yields. The reactivity, regioselectivity, and stereoselectivity of these reactions were compared with semi-empirical theoretical calculations. Evidence is provided for rather unusual two parallel reaction pathways for the
亚砜和砜取代的二氢-2-吡啶酮和2-吡啶酮与富含电子的二烯的环加成反应以良好或合理的收率得到了新的双环和三环产物。将这些反应的反应性,区域选择性和立体选择性与半经验理论计算进行了比较。砜取代的2-吡啶酮与环戊二烯的交叉Diels-Alder反应提供了非常罕见的两个平行反应途径的证据。