Thermal Reaction of Azulene and Some of Its Symmetrically Substituted Methyl Derivatives with Dimethyl Acetylenedicarboxylate
作者:Yi Chen、Hans-J�rgen Hansen
DOI:10.1002/hlca.19930760111
日期:1993.2.10
It is shown that azulene (1) and dimethyl acetylenedicarboxylate (ADM) in a fourfold molar excess react at 200° in decalin to yield, beside the known heptalene- (5) and azulene-1,2-dicarboxylates (6), in an amount of 1.6% tetramethyl (1RS,2RS,5SR,8RS)-tetracyclo[6.2.2.22,501,5]tetradeca-3,6,9,11,13-pentaene-3,4,9,10-tetracarboxylate(‘anti’-7) as a result of a SHOMO (azulene)/LUMO(ADM)-controlled addition
结果表明,四氢摩尔过量的a (1)和乙炔二羧酸二甲酯(ADM)在十氢化萘中在200°下反应,除已知的庚烯(5)和a1,2-二羧酸酯(6)外,还会生成萘。 1.6%四甲基(1 RS,2 RS,5 SR,8 RS)-四环[6.2.2.2 2,5 0 1,5 ] tetradeca-3,6,9,11,13-pentaene-3,4, 9,10-四羧酸(“反” -7),为SHOMO(薁)/ LUMO(ADM)控制的加成ADM到的七元环的结果1后跟一个狄尔斯-阿尔德如此形成的三环中间体16(参见方案3)与第二分子ADM反应。通过X射线衍射分析确认了“抗” -7的结构。类似地,5,7- dimehtylazulene(的热反应3)用萘烷中过量ADM在120℃导致的形成CA。“1%抗‘ - 12,’的7,12-二甲基衍生物的抗” -7,旁相应heptalene- 10和甘菊环-1,2- dicaboxy