Thermal and Ru-catalyzed Reactions of Styryl-Substituted Azulenes with Dimethyl Acetylenedicarboxylate
作者:Anne Andr�e Sophie Briquet、Hans-J�rgen Hansen
DOI:10.1002/hlca.19940770723
日期:1994.11.2
are formed, the corresponding benzanellated azulene trans-29 ist found to be the second main product (21 and 10%, respectively) under both reaction conditions. The thermal reaction yields also the benzanellated azulene 28 which is not found in the catalyzed variant of the reaction. Heptalene-1,2-dicarboxylates are also formed from 4-[(E)-styryl]azulenes (e.g. (E)-33 and (E)-34; Scheme 14) and ADM at
1-[(E)-苯乙烯基] azulenes与十氢化萘中的乙炔二羧酸二甲酯(ADM)在190-200°的热反应不会导致相应的庚烯1,2-二羧酸酯的形成(方案2)。主要产物是相应的薁基-1,2-二羧酸酯(见4和9),并伴有benzanellated薁反式- 10A和反式- 11分别。后者的化合物通过起始天青烯和ADM的Diels - Alder反应,然后与ADM进行烯反应形成(参见方案3)。[RuH 2(PPh 3)4 ]在ACN中于110°催化4,6,8-三甲基-1-[[(E)-4-R-苯乙烯基] azulenes(R = H,MeO,Cl;流程4)与ADM的反应主要成分为1,2-二氮杂ul。但是,在这种情况下,也会少量生成相应的庚烯1,2-二羧酸酯(3-5%;方案4)。所述benzanellated薁反式- 10A和反式-图10b是在反应混合物中少量(2-3%)也有发现。还观察到了少量的(