Synthesis of a β-cyclodextrin derivative bearing an azobenzene group on the secondary face
摘要:
An oxidative coupling Sonogashira-type reaction has been used to synthesize a beta-cyclodextrin derivative bearing an azobenzene group on the secondary face for the first time starting from a beta-cyclodextrin propargylated at one of its C-2 positions. The de-O-propargylation reaction and the formation of an oxidative homocoupling dimer were found to compete with the desired product. under several Sonogashira-type reaction conditions. However, the use of a diluted reductive atmosphere of H-2 avoided the former and diminished the latter. (C) 2008 Elsevier Ltd. All rights reserved.