Synthesis of (4-nitro-1H-indol-6-yl)- and (4-amino-1H-indol-6-yl)phosphonic acid derivatives

Chemistry of Heterocyclic Compounds - A convenient methodology for the synthesis of previously unreported (1H-indol-6-yl)phosphonic acid derivatives has been described. Reaction of...     

Functional derivatives of (bromomethyl)phosphonic acid

Reaction of equimolar amounts of (bromomethyl)phosphonic dichloride and phenol gives phenyl (bromomethyl)chlorophosphonate. Its reactions with heptamethyldisilazane, N,O-bis(trimethylsilyl)acetamide, and potassium thiocyanate, leading respectively to a silylamidophosphonate, a silyl phosphonate, and an isothiocyanatophosphonate, were studied. (Bromomethyl)(chloromethyl)phosphinoyl isocyanate was synthesized. Chemical properties of the prepared functionalyzed (bromomethyl)phosphonates were investigated.Translated from Zhurnal Obshchei Khimii, Vol. 74, No. 8, 2004, pp. 1262–1265.Original Russian Text Copyright © 2004 by Kibardina, M. Pudovik, Kamalov, and A. Pudovik.This revised version was published online in April 2005 with a corrected cover date.     

Crystal Structure of 1-(N-Dichlorophosphoryl-N- cyclohexyl)-amino-1-dichlorophosphinyl-chloromethane

1 INTRODUCTION The substituted aminomethylenediphosphonic acids as well as their derivatives are extensively used in treating various bone diseases, such as osteoporosis, Paget抯 disease and hypercalcemia due to malignancy[1]. They also have activiti…     

Reaction of bis(chloromethyl) phosphonic acid with aminoacetic acid

Summary The reaction of bis(chloromethyl)phosphonic acid with aminoacetic acid which leads to the formation of N-methyl-N-carboxymethylaminomethylphosphonic acid was studied, and a reaction scheme was suggested which included the formation and subsequent opening of a four-membered 1,3-phosphetidine ring.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp 694–696, March, 1969.     

Synthesis of 10-propargylfolic acid from 2-amino-6-(bromomethyl)-4(1h)-pteridinone

6-(Bromomethyl)-2,4-pteridinediamine hydrobromide (1) is readily converted to 2-amino-6-(bromomethyl)-4(1H)-pteridinone hydrobromide (2) by treatment with 48% hydrobromic acid. Compound 2 is of interest for direct attachment of the (2-amino-3,4-dihydro-4-oxo-6-pteridinyl)methyl group to appropriate side-chain precursors of analogues of folic acid, particularly those bearing functional groups incompatible with conditions required for hydrolytic deamination of the corresponding 2,4-diaminopteridine analogues. An example of the use of 2 in this connection is demonstrated through synthesis of 10-propargylfolic acid.     

The synthesis of bis(mercaptomethyl)phosphonic acid

Conclusions The reaction of bis(chloromethyl)phosphonic acid with thiourea gave the hydrochloride of bis(thio-ureylmethyl)phosphonic acid, the alkaline decomposition of which gave bis(mercaptomethyl)phosphonic acid.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1625–1626, July, 1968.     

Reduction of chromium(VI) by phosphonic acid

The kinetics of electron transfer between chromium(VI) and H3PO3, yielding chromium(III), have been investigated in HClO4 and H2SO4 media by visible spectrophotometry. The rate of reaction increased with increasing [H2SO4] and [HClO4]. A rate law based on ester formation preceding the electron transfer has been established and a possible mechanism has been proposed. The mechanism and the derived rate law are consistent with the observed kinetics. This revised version was published online in June 2006 with corrections to the Cover Date.