Laticyclic Conjugated Polyenes. Study on Diels−Alder Cycloadditions of a Facially Dissymmetric Maleic Anhydride
作者:Teh-Chang Chou、Tzong-Shing Jiang、Jenn-Tsang Hwang、Kuan-Jiuh Lin、Cheng-Tung Lin
DOI:10.1021/jo990256r
日期:1999.6.1
obtained from the Diels-Alder cycloaddition of the bicyclic ring-fused cyclohexadiene 1 and acetylenedicarboxylate. Maleic anhydride 2 readily underwent the Diels-Alder cycloadditions with anthracene, 1,3-diphenylisobenzofuran, cyclopentadiene, 1,3-cyclohexadiene, 6,6-dimethylfulvene, and o-quinodimethane. All the cycloadditions occurred exclusively on the pi-face syn to the etheno bridge of 2, thereby
由从双环稠合的环己二烯1和乙炔二羧酸酯的Diels-Alder环加成反应得到的化合物9合成四环稠合的,表面不对称的马来酸酐2。马来酸酐2容易与蒽,1,3-二苯基异苯并呋喃,环戊二烯,1,3-环己二烯,6,6-二甲基富勒烯和邻喹二甲烷进行狄尔斯-阿尔德环加成反应。所有的环加成仅发生在2的乙炔桥的pi面上,因此在蒽,环戊二烯,1,3-环己二烯和6,6-二甲基富烯的环加成情况下,会生成相应的加合物11a,18b,22b ,和含有平行排列的三个双键的23b。通过X射线结构确定明确地确定了18b和22b的结构。