Patent · US Expired

Process for the preparation of 2-halogenopyridinealdehydes and novel 2-halogenopyridinealdehydes

US5708180A · kind A · utility

13Cited by

6References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gunther Beck · Leverkusen, DE
Helmut Heitzer · Leverkusen, DE

Key dates

Filing date	Nov 27, 1996
Grant date	Jan 13, 1998
Priority date	—
Expiry date	Nov 27, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D409/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The reaction of cyanoolefins, aminocarbonylolefins or hydroxyiminoolefins with a Vilsmeier reagent leads to 2-halogenopyridines which bear aldehyde groups in the 3 and/or 5 position. These pyridinealdehydes are valuable intermediates for the preparation of pharmaceuticals and crop protection agents.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.