Some Unusual Products from the Thermal Reaction of Azulenes with Dimethyl Acetylenedicarboxylate
作者:Anette Magnussen、Hans-J�rgen Hansen
DOI:10.1002/hlca.19970800219
日期:1997.3.24
The thermalreaction of azulene-1-carbaldehydes 5 and 6 with excess dimethylacetylenedicarboxylate (ADM) in decalin leads mainly to the formation of (1 + 1) and (1 + 2) adducts arising from the addition of ADM at the seven-membered ring of the azulenes (cf. Schemes 2 and 4). The (1 + 2) adducts are formed in a homo-Diels-Alder reaction of ADM and isomeric tricyclic carbaldehydes which are derived
氮杂-1-甲醛5和6与十氢化萘中过量的乙炔二甲酸二甲酯(ADM)的热反应主要导致形成(1 + 1)和(1 + 2)加合物,这是由于在七元单体上添加了ADM而引起的。天青石的环(参见方案2和4)。(1 + 2)加合物是在ADM与异构三环甲醛的均一Diels-Alder反应中形成的,它们通过可逆的[1 s 5 s ] -C位移而衍生自伯三环甲醛,(请参阅方案3和5) 。如此形成的五环甲醛似乎经历了深层次的骨架重排(cf. 方案7)最终导致分别形成甲酰基-四氢环戊[ bc ] ac-四酯12和19。在其他情况下,例如,甘菊环-1- carbaldehydes 7和8(参见方案8),用过量的ADM热反应配料仅已知tetracycfic(1 + 2)类型的加合物的抗- 26为“抗” - 29。1,3,4,8-四甲基az(9)与十氢化萘中过量ADM的热反应导致低产率地形成两个(1 + 2)和一个(1 +