1,4-Addition of tetraethyl fluoromethylenebisphosphonate to α,β-unsaturated compounds
摘要:
Tetraethyl fluoromethylenebisphosphonate in the presence of cesium carbonate in DMF undergoes efficient 1,4-addition to Michael acceptors having terminal double bond such as alpha,beta-unsaturated ketones, esters, sulfones, sulfoxides, and phosphonates to yield the corresponding adducts (alpha-alkyl-alpha-fluoromethylenebisphosphonates) in good to excellent yields. (C) 2011 Elsevier B.V. All rights reserved.