Cyclic Vinyl <i>p</i>-Tolyl Sulfilimines as Chiral Dienophiles: Diels−Alder Reactions with Furan and Acyclic Dienes
作者:José L. García Ruano、Carlos Alemparte、Fernando R. Clemente、Lorena González Gutiérrez、Ruth Gordillo、Ana M. Martín Castro、Jesús H. Rodríguez Ramos
DOI:10.1021/jo016174w
日期:2002.5.1
its Diels-Alder reactions with furan and acyclic dienes has been investigated. A complete pi-facial selectivity for 2, opposite to that observed from its precursor 1, is the main feature of all these cycloadditions. Moreover, the high exo selectivity observed in reactions of 2 with furan (not observed for 1) contrasts with the almost complete endo selectivity with other cyclic and acyclic dienes. Additionally
研究了由(Z)-3-对甲苯基亚磺酰基丙烯腈1合成的亚砜亚胺2在呋喃和无环二烯的Diels-Alder反应中的双亲行为。与所有从其前体1观察到的相反,对2的完全pi选择性是所有这些环加成反应的主要特征。此外,在2与呋喃的反应中观察到的高exo选择性(对于1没有观察到)与其他环状和非环状二烯几乎完全的内在选择性相反。另外,用Dane's二烯和1-取代的丁二烯获得的相反的区域选择性(对于1没有观察到)也值得注意。从合成的角度来看,这种行为使亲双烯体1和2被视为互补的前体。