Inverse-electron-demand Diels–Alder reactions of masked o-benzoquinones with enol ethers and styrene
作者:Shih-Yu Gao、San Ko、Yen-Lin Lin、Rama Krishna Peddinti、Chun-Chen Liao
DOI:10.1016/s0040-4020(00)00937-6
日期:2001.1
stereoslective inverse-electron-demand Diels–Alder reactions of masked o-benzoquinones (MOBs) 1a–1h derived from the corresponding 2-methoxyphenols 2a–2h with benzyl vinyl ether, dihydrofuran and styrene to afford the highly functionalized bicyclo[2.2.2]octenone derivatives are described. The MOBs having electron-deficient substituents were found to undergo more facile Diels–Alder cycloadditions with these dienophiles
由相应的2-甲氧基苯酚2a - 2h衍生的掩蔽邻苯甲醌1a - 1h与苄基乙烯基醚,二氢呋喃和苯乙烯的区域和立体选择反电子需求的Diels-Alder反应与苄基乙烯基醚,二氢呋喃和苯乙烯[2.2] [2]描述了辛烯酮衍生物。发现具有缺电子取代基的MOB与这些亲二烯体进行的更容易的Diels-Alder环加成反应。富含电子的亲双烯体二氢吡喃不是MOB的合适的2π伴侣。尝试根据前沿分子轨道理论解释这些Diels-Alder环加成物的区域化学。