Process for the preparation of herbicidal derivatives
US6552187B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2001 |
| Grant date | Apr 22, 2003 |
| Priority date | — |
| Expiry date | Nov 29, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C233/11
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of compounds of formula (I), which process comprises reacting a compound of formula (II), in an inert organic solvent, optionally in the presence of a base, with a compound of formula (IV), (IVa) or (IVb), and optionally converting the resulting compound of formula (I) wherein G is a metal ion equivalent or an ammonium cation, by salt conversion into the corresponding salt of formula (I) wherein G is a sulfonium or phosphonium cation, or by treatment with a Brönsted acid into the corresponding compound of formula (I) wherein G is hydrogen, and ‘in situ’ conversion of compounds of formula (I) with an electrophile of formula (XII) or (XIId) G0—L (XII) or R32—N═C═X3 (XIId), optionally in the presence of an acid-binding agent or a catalyst, to the compounds of formula (Ia).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.