Synthesis 2005(13): 2119-2121  
DOI: 10.1055/s-2005-869984
SHORTPAPER
© Georg Thieme Verlag Stuttgart · New York

The First Synthesis of Novel (1-Alkoxycarbonyloxyethylidene)-1,1-bisphosphonic Acid Derivatives Taking Advantage of the Rearrangement Characteristic of the Tetramethyl Ester of Etidronate

Petri A. Turhanen*, Jouko J. Vepsäläinen
University of Kuopio, Department of Chemistry, P.O. Box 1627, 70211, Kuopio, Finland
Fax: +358(17)163259; e-Mail: Petri.Turhanen@uku.fi;
Further Information

Publication History

Received 21 February 2005
Publication Date:
27 June 2005 (online)

Abstract

A novel method to (1-alkoxycarbonyloxyethylidene)-1,1-bisphosphonic acid derivatives 1a-c, where R = Et, Pr, i-Bu, from the tetramethyl ester of etidronate (3) and a novel alkoxycarbonyl chloride has been developed; products were isolated in reasonable yields (60-88%). The easy rearrangement characteristic of etidronate tetramethyl ester to tetraalkyl phosphonophosphate was advantageous.