Facile high yielding synthesis of symmetric esters of methylenebisphosphonic acid
摘要:
The 1H-tetrazole catalyzed coupling of methylenebis(phosphonic dichloride), CH2(POCl2)(2), with primary alkyl, cyclic secondary alkyl, aromatic, and silicon- and fluorine-containing alcohols selectively affords symmetric P,P'-dialkyl partial esters as wen as homoleptic and mixed tetraesters. Two partial ester intermediates, methylenebis(2-ethylhexyl phosphonic chloride) and 2-ethylhexyl methylenebisphosphonic trichloride, were observed by H-1- and P-31 NMR spectroscopy in the esterification of CH2(POCl2)(2) with 2-ethyl-1-hexanol. (C) 2001 Elsevier Science Ltd. All rights reserved.
Facile high yielding synthesis of symmetric esters of methylenebisphosphonic acid
作者:Dominique C Stepinski、Derek W Nelson、Peter R Zalupski、Albert W Herlinger
DOI:10.1016/s0040-4020(01)00846-8
日期:2001.10
The 1H-tetrazole catalyzed coupling of methylenebis(phosphonic dichloride), CH2(POCl2)(2), with primary alkyl, cyclic secondary alkyl, aromatic, and silicon- and fluorine-containing alcohols selectively affords symmetric P,P'-dialkyl partial esters as wen as homoleptic and mixed tetraesters. Two partial ester intermediates, methylenebis(2-ethylhexyl phosphonic chloride) and 2-ethylhexyl methylenebisphosphonic trichloride, were observed by H-1- and P-31 NMR spectroscopy in the esterification of CH2(POCl2)(2) with 2-ethyl-1-hexanol. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthesis of Symmetrical Methylenebis(Alkyl Hydrogen Phosphonates) by Selective Cleavage of Methylenebis(Dialkyl Phosphonates) with Morpholine
作者:Gantla Vidyasagar Reddy、Hollie K. Jacobs、Aravamudan S. Gopalan、Richard E. Barrans、Mark L. Dietz、Dominique C. Stepinski、Albert W. Herlinger
DOI:10.1081/scc-120027271
日期:2004.1
c acids has been of recent interest due to their potential therapeutic applications. This paper describes a convenient method to prepare symmetrical methylenebis(alkyl hydrogen phosphonates) by the selective cleavage of the corresponding methylenebis(dialkyl phosphonate) with refluxing morpholine. The effects of structural variations on the amine as well as the substrate have been investigated to understand