Dual Behavior of Masked <i>o</i>-Benzoquinones in Intermolecular Diels−Alder Reactions with Acyclic Dienes: A Rapid Entry to Polyfunctionalized Bicyclo[2.2.2]oct-5-en-2-ones and <i>cis</i>-Decalins
作者:Chien-Hsing Chen、Rama Krishna Peddinti、N. S. Kameswara Rao、Chun-Chen Liao
DOI:10.1021/jo0494580
日期:2004.8.1
14a−f−17a−f with regio- and stereoselectivity, except in the case of MOB 8. The formation of cis-decalins in these Diels−Alder reactions illustrates the dienophilic character of MOBs, in addition to their general behavior as dienes. The ratio of the two cycloadducts obtained in each reaction as a result of the dual character of MOBs depends on the nature and/or position of the substituents on both the
的潜力掩蔽Ó -benzoquinones,即,6,6-二甲氧基-2,4-环己二烯酮5 - 8,这两个反应在它们的分子间反应的二烯和亲双烯体已被证明。掩蔽Ô -benzoquinones(MOBS)5 - 8原位产生的,由2-甲氧基苯酚1 - 4后行分子间狄尔斯-阿尔德环加成与非环状1,3-二烯9A - ë提供双环[2.2.2] octenones 10A - ˚F -图13A - ˚F连同顺-decalin衍生物14a的- ˚F - 17A - ˚F与区域选择性和立体选择性,除了在MOB的情况下8。在这些Diels-Alder反应中顺式十氢化萘的形成除了说明了MOB作为二烯的一般行为外,还说明了MOB的亲二苯特性。由于MOB的双重特征,在每个反应中获得的两个环加合物的比例取决于环己二烯酮部分和所添加的共轭无环二烯上的取代基的性质和/或位置。由分子间Diels-Alder反应中MOB的二烯