The synthesis of 1-amino-2-hydroxy- and 2-amino-1-hydroxy-substituted ethylene-1,1-bisphosphonic acids and their N-methylated derivatives
作者:D.V. Griffiths、J.M. Hughes、J.W. Brown、J.C. Caesar、S.P. Swetnam、S.A. Cumming、J.D. Kelly
DOI:10.1016/s0040-4020(97)10245-9
日期:1997.12
A synthesis of 2-amino-1-hydroxyethylene-1,1-bisphosphonic acid 3 has been developed from N-phthaloylglycine via dimethyl 2-(N-phthaloylamino)acetylphosphonate 1. The preparation of the N-methylated and N,N-dimethylated derivatives 4 and 5 has been achieved by the reaction of 3 with formic acid and formaldehyde. The synthesis of 1-amino-2-hydroxyethylene-1,1-bisphosphonic acid 9 (RR′H) and its N-methylated
various carboxylic acids, a one-pot procedure for the synthesis of the corresponding 1-hydroxy-1,1-bis(phosphonic acid)s is reported. The efficiency of this simple methodology is illustrated by synthesizing well-known marketable amino hydroxy bis(phosphonate)s such as alendronate or N-methyl pamidronate without additional steps for the protection/deprotection of the amine function.