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Synthesis 2005(13): 2119-2121
DOI: 10.1055/s-2005-869984
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
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.
Key words
bisphosphonate - etidronate - ester - synthesis - prodrug