Influence of Diene Substitution on Diels−Alder Reactions between Vinyl Dihydronaphthalenes and (S<i>S</i>)-2-(<i>p</i>-Tolylsulfinyl)-1,4-benzoquinone
作者:M. Carmen Carreño、Susana García-Cerrada、M. Jesús Sanz-Cuesta、Antonio Urbano
DOI:10.1021/jo0342774
日期:2003.5.1
The asymmetric Diels-Alder reaction between 2-(E-2-acetoxyvinyl)-8-tert-butyl-3,4-dihydronaphthalene (8) and enantiopure (SS)-2-(p-tolylsulfinyl)-1,4-benzoquinone (1) takes place exclusively on the unsubstituted C(5)-C(6) double bond of (SS)-1 with a very high control of the chemo-, regio-, and diastereoselectivity of the process affording tetracyclic sulfinyl derivative 13a possessing five stereogenic
2-(E-2-乙酰氧基乙烯基)-8-叔丁基-3,4-二氢萘(8)和对映纯(SS)-2-(对甲苯磺酰基)-1,4-苯醌之间的不对称Diels-Alder反应(1)仅在(SS)-1的未取代C(5)-C(6)双键上发生,对该方法的化学,区域和非对映选择性具有非常高的控制权,从而获得具有以下特征的四环亚磺酰基衍生物13a:五个立体成因中心。缺少叔丁基的类似物二烯9产生较少的化学选择性反应(C(2)-C(3)/ C(5)-C(6):60/40),有利于通过亚砜-的反应取代的双键C(2)-C(3)的值为1。远端叔丁基的立体效应和由于OAc取代基引起的电子因子正在控制该过程。