The regioselective upper-rim functionalization of calix[4]arene have been performed to prepare all the multisubstituted diphenylphosphine derivatives. In addition, the X-ray structures of 5,17-dibromo-11,23-bis(diphenylphosphino)-25,26,27,28-tetra-n-propoxycalix[4]arene and 5,11,17,23-tetrakis(diphenylphosphino)-25,26,27,28-tetra-i-propoxy-calix[4]arene have been determined. Regioselective functionalizations have been achieved using methods that involve appropriate choices of bases, alkyllithium-solvent systems, stoichiometry, and reaction times. A new and convenient method for selectively preparing derivitized calix[4]arenes at proximal positions in relative large scale quantity has been developed and involves a transesterification of the distal diester derivative into the proximal isomer.Key words: calix[4]arenes, phosphine, upper-rim, X-ray structure, transesterification.
对calix[4]arene的上缘选择性官能化已经进行,以制备所有多取代二苯基膦衍生物。此外,已确定了5,17-二溴-11,23-双(二苯基膦基)-25,26,27,28-四-n-丙氧基calix[4]arene和5,11,17,23-四(二苯基膦基)-25,26,27,28-四异丙氧基calix[4]arene的X射线结构。通过适当选择碱、烷基锂-溶剂系统、化学计量、反应时间等方法实现了选择性官能化。开发了一种新的便捷方法,可在相对较大规模上选择性地制备calix[4]arenes的衍生物,涉及将远端二酯衍生物转酯化为近端异构体。关键词:calix[4]arenes、膦、上缘、X射线结构、转酯化。