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(M
OBS)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