Synthesis of two Novel 2-Aminocyclopropylidene-1,1-bisphosphonates
摘要:
The synthesis of tetraethyl aminocyclopropylidene-1,1-bisphosphonate 1 and tetraethyl 2-(aminomethyl)cyclopropylidene-1,1-bisphosphonate 2 are described. The key steps include Michael addition, cyclisation and Curtius reaction for compound 1 and cyclisation, azide nucleophilic substitution and Staudinger reaction for 2.
ON THE SYNTHESIS OF (±) ETHYL 2,2-BIS(DIETHOXYPHOSPHORYL)-CYCLOPROPANE CARBOXYLATES
摘要:
The synthesis of (+/-) ethyl 2,2-bis(diethoxyphosphoryl)cyclopropane carboxylates 1 is described. The key-steps are a Michael-type addition and ensuing intramolecular cyclisation reaction.
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.
The synthesis of tetraethyl aminocyclopropylidene-1,1-bisphosphonate 1 and tetraethyl 2-(aminomethyl)cyclopropylidene-1,1-bisphosphonate 2 are described. The key steps include Michael addition, cyclisation and Curtius reaction for compound 1 and cyclisation, azide nucleophilic substitution and Staudinger reaction for 2.
ON THE SYNTHESIS OF (±) ETHYL 2,2-<i>BIS</i>(DIETHOXYPHOSPHORYL)-CYCLOPROPANE CARBOXYLATES
The synthesis of (+/-) ethyl 2,2-bis(diethoxyphosphoryl)cyclopropane carboxylates 1 is described. The key-steps are a Michael-type addition and ensuing intramolecular cyclisation reaction.