A facile method to construct cyclic α,α-difluoromethylenephosphonate—A novel cyclic phosphate mimic
摘要:
A facile and efficient synthesis of cyclic alpha,alpha-difluoromethylenephosphonates by halogen-induced intramolecular cyclization of beta-allenic alpha,alpha-difluoromethylenephosphonates is described. The protocol gives multi-substituted six-membered phosphonates with high regioselectivity, providing a new entry to the cyclic phosphate mimics which is still an unexplored but promising area. (C) 2011 Elsevier B.V. All rights reserved.