Studies on Organophosphorus Compounds; LI. A New and Facile Route to 2-Substituted 1,1-Cyclopropanediylbis(phosphonic acids)
作者:Chengye Yuan、Chaozhong Li、Yixiang Ding
DOI:10.1055/s-1991-26591
日期:——
Reaction of bromomethylenebis(phosphonates) 1 with electrondeficient alkenes 2a-d as Michael acceptors in the presence of thallium(I) ethoxide leads to a new and facile route to 2-substituted 1,1-cyclopropanediylbis(phosphonates) 3 in satisfactory yield. These are converted into the corresponding free acids 7 by treatment with chlorotrimethylsilane in the presence of potassium iodide followed by treatment with water. The products resulted from bromomethylenebis(phosphonates) 1 and other alkenes 2e, f and methyl vinyl ketone are identified and discussed.