A process for preparing diaminopyridines in high yield and in pure form by treating a solution of a nitrohydrazinopyridine with an activated nickel catalyst in the presence of hydrogen gas.
The present invention relates to novel salt of 3,4-diaminopyridine as 3,4-diaminopyridine dihydrochloride (or Amifampridine dihydrochloride), useful in the preparation of pharmaceutical composition thereof. The present application also relates to an improved process for the preparation of substantially pure Amifampridine dihydrochloride (I) having purity of greater than 99.5% (by HPLC).
作者:Paul Barraclough、James W. Black、David Cambridge、Derek A. Demaine、V. Paul Gerskowitch、Heather Giles、Alan P. Hill、Robert A. D. Hull、Ramachandran Lyer、W. Richard King、David J. Livingstone、Malcolm S. Nobbs、Peter Randall、Gita P. Shah、Mark V. Whiting
DOI:10.1002/ardp.19903230812
日期:——
Isomazoleanalogues which have achiral electron withdrawing substituents at the 4′‐position and analogues with heterocyclic ‘C’ rings have been synthesized and evaluated as inotropic agents. It was found that pyridyl could replace phenyl in the ‘C’ ring without loss of activity. The 4′‐methylsulphonyl, ‐cyano, ‐carboxamido, and acetyl analogues had similar inotropic potencies to Isomazole whilst displaying