Four amidecrownophanes 3a–d, including three new compounds 3a, 3c and 3d, were readily prepared through amidation of dicarbonyl dichloride with diamine derivatives without using high-dilution or template conditions and then the tandem Claisen rearrangement. At the macrocyclization step the intramolecular hydrogen bonding of the intermediate might play an important role to give high yields of 1:1 macrocycles
通过使用二胺衍
生物将二
氯化二羰基二酰胺酰胺化,无需使用高稀释度或模板条件,然后串联克莱森重排,即可轻松制备出四个酰胺基乌鸦烷3a - d,包括三个新化合物3a,3c和3d。在大环化步骤中,中间体的分子内氢键可能起重要作用,以高收率为1:1的大环。