Ritter reactions. Part 11. The diverse reactivity of 5,10-(azenometheno)-5H-dibenzo[a,d]cyclohepten-11-yl amides with dimethyl acetylenedicarboxylate
作者:Djamal Djaidi、Roger Bishop、Donald C. Craig、Marcia L. Scudder
DOI:10.1039/p19960001859
日期:——
Each of the 5,10-(azenometheno)-5H-dibenzo[a,d]cyclohepten-11-yl amide derivatives 8a–c reacts with dimethylacetylenedicarboxylate (DMAD) through its imine group to yield novel and unexpected heterocyclic products. Imine 8a undergoes 1:1 addition to give the conjugated enamine 10, or 1:2 addition yielding the cyclobutyl tetraester 11, depending on the conditions employed. In contrast, imine 8b undergoes
每个5,10-(叠氮基甲基)-5 H-二苯并[ a,d ]环庚-11-基酰胺衍生物8a–c通过其亚胺基与乙炔基二羧酸二甲酯(DMAD)反应,生成新颖且出乎意料的杂环产物。亚胺8a进行1∶1加成以得到共轭烯胺10,或1∶2加成得到环丁基四酯11,这取决于所采用的条件。相反,亚胺8b同时加入DMAD和甲醇,得到原酸酯12,而亚胺8c转化为不饱和内酰胺14。提供了对这些多样且不可预测的反应的初步机理解释。这些由化合物8c,11、12和14的X射线晶体结构支撑。分离出四酸酯11作为其包合化合物(11)·(C6 H 6) 0.5以及其中涉及的宿主-客体相互作用以晶体工程学术语进行了分析。