Patent · US Expired

Method for obtaining pure enantiomers of a pyridazinone derivative

US6180789A · kind A · utility

5Cited by

1References

16Claims

0Family size

Assignee

ORION CORPORATION · FI

Inventors

Mika Timmerbacka · Veikkola, FI
Jorma Lehtonen · Kuohu, FI
Veli Pekka Tanninen · Espoo, FI
Esa Muttonen · Espoo, FI
Jukka Kaukonen · Helsinki, FI
Riikka Hyppola · Espoo, FI
Reijo Backstrom · Helsinki, FI

Key dates

Filing date	Feb 4, 1999
Grant date	Jan 30, 2001
Priority date	—
Expiry date	Feb 4, 2019

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61P43/00
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The present invention relates to a method for preparing optically active enantiomers of [[4-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)phenyl]-hydrazono]pro panedinitrile (I), particularly (-) enantiomer of (I). Furthermore, the invention relates to a novel crystalline polymorphic form of the (-) enantiomer.

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