Patent · US Expired

Process for preparing 4,6-diaminopyrimido[5,4-d]pyrimidines

US6680384B2 · kind B2 · utility

1Cited by

2References

9Claims

0Family size

Assignee

BOEHRINGER INGELHEIM PHARMA GMBH & CO. KG · DE

Inventors

Werner Belzer · Sankt Goar, DE
Ralf Lock · Mainz, DE
Werner Rall · Mittelbiberach, DE

Key dates

Filing date	Mar 12, 2002
Grant date	Jan 20, 2004
Priority date	—
Expiry date	Mar 12, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D487/04
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for preparing 4,6-diaminopyrimido[5,4-d]pyrimidines of formula I, wherein R1 to R4 have the meanings given in claim 1, as well as new intermediate products which are involved in this process.

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