Process for halomethyl ethers of hydroxyiminomethyl quaternary pyridinium salts
USRE41898E1 · kind E1 · reissue
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2008 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Nov 19, 2028 |
Classification
- Technology area (CPC —)General
Abstract
A halide salt of a 1-(hydroxyiminomethyl-1-pyridino)-3-(halomethyl)-2-oxapropane is prepared by adding a pyridinealdoxime to a bis-halomethylether in such a manner that the bis-halomethylether is maintained in excess throughout the addition. This procedure produces the halide salt of a 1-(hydroxyiminomethyl-1-pyridino)-3-(halomethyl)-2-oxapropanein high yield and purity, which facilitates its use as an intermediate in the manufacture of an asymmetrically substituted 1,3-di(1-pyridino)-2-oxapropane, a class of compounds that are generally useful antidotes to various toxic agents. A prominent member of the class is the dimethylsulfonate salt of 1-(2-hydroxyiminomethyl-1-pyridino)-3-(4-carbamoyl-1-pyridino)-2-oxapropane. The use of mercaptoalkyl-functionalized polymers is disclosed as a preferred metal ion scavenger for a final purification step in the manufacture of these compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.