Using methanesulfonic acid as a catalyst, a series of cyclododeceno[b]indene derivatives were synthesized by the cyclization of α-benzylcyclododecanones, which were prepared by the reactions of cyclododecanones with a variety of substituted benzyl chlorides or bromides using NaH as a base. Their structures were confirmed by mp, IR spectra, 1H-NMR, 13C-NMR, MS, and x-ray diffraction. The preferred conformations were analyzed by crystal structure, 1H-NMR and quantum chemistry calculations, and compared with the x-ray diffraction structure of 2,3,5,6-bis(ortho-1,10-decylidene)dihydropyrazine. The results showed that the cyclododecene moiety adopted a preferred [1ene2333] conformation, and the substituted groups at aromatic ring had no significant influence on the conformation.
以
甲磺酸为催化剂,通过α-苄基
环十二酮的环合反应合成了一系列
环十二烯并[b]
茚衍
生物,这些α-苄基
环十二酮是由
环十二酮与各种取代的苄基
氯或
溴在NaH作为碱的条件下反应制备的。它们的结构通过熔点、红外光谱、氢核磁共振(1H-NMR)、碳核磁共振(13C-NMR)、质谱(MS)和X射线衍射得到确认。通过晶体结构、1H-NMR和量子
化学计算分析了其优选构象,并与2,3,5,6-双(邻-1,10-癸亚甲基)二氢
吡嗪的X射线衍射结构进行了比较。结果表明,
环十二烯部分倾向于采取[1ene2333]构象,而芳环上的取代基对构象没有显著影响。