Diels−Alder Reactions with 2-(Arylsulfinyl)-1,4-benzoquinones: Effect of Aryl Substitution on Reactivity, Chemoselectivity, and π-Facial Diastereoselectivity
作者:M. Carmen Carreño、José L. García Ruano、Antonio Urbano、Cynthia Z. Remor、Yolanda Arroyo
DOI:10.1021/jo9913107
日期:2000.1.1
Eu(fod)(3)- or BF(3).OEt(2)-catalyzed conditions. The synthesis of endo-adduct [4aS,5S,8R,8aR,SS]-9d resulting from cycloaddition on the substituted C(2)-C(3) double bond was achieved in a chemo- and diastereoselective way from quinone 1d in the presence of ZnBr(2). The reactivity and selectivity of the process proved to be dependent on the electron density of the arylsulfinyl group.
(SS)-2-(2'-甲氧基萘亚磺酰基)-1、4-苯醌(1b),2-(对甲氧基苯基亚磺酰基)-1,4-苯醌(1c)和2-(对-苯基据报道,硝基苯基亚磺酰基)-1,4-苯醌(1d)与环戊二烯。这些环加成反应使非对映异构体内加合物具有高度化学和立体选择性,这是由在热和Eu(fod)(3)-或BF( 3).OEt(2)催化的条件。在取代的C(2)-C(3)双键上通过环加成反应制得的内加合物[4aS,5S,8R,8aR,SS] -9d是通过化学和非对映选择性的方式从醌1d中合成的ZnBr(2)的存在。事实证明,该方法的反应性和选择性取决于芳基亚磺酰基的电子密度。