Patent · US Expired

Chroman derivatives

US6646136B1 · kind B1 · utility

8Cited by

1References

28Claims

0Family size

Assignee

Merck Patent GmbH · DE

Inventors

Heinz-Herman Bokel · Darmstadt, DE
Peter Mackert · Egelsbach, DE
Christoph Müramann · Reinheim, DE
Nobert Schweickert · Seeheim-Jugenheim, DE

Key dates

Filing date	Feb 28, 2002
Grant date	Nov 11, 2003
Priority date	—
Expiry date	Feb 28, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/55
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Chroman derivatives of the formula I in whichR1 is acyl having 1-6 C atoms, —CO—R5 or an amino protective group,R2 is H or alkyl having 1-6 C atoms,R3, R4 in each case independently of one another are H, alkyl having 1-6 C atoms, CN, Hal or COOR2,R5 is phenyl which is unsubstituted or mono- or disubstituted by alkyl having 1-6 C atoms, OR2 or Hal,X is H, H or O,Hal is F, Cl, Br or I,and their salts, are suitable as intermediates in the synthesis of medicaments.

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