Patent · US Active

2H-chromenes annelated at C5-C6 and methods of making and using thereof

US8217188B2 · kind B2 · utility

1Cited by

1References

6Claims

0Family size

Assignee

CORNING INCORPORATED · US

Inventors

Suresh Das · Thrissur, IN
Bruno Dufour · Fontainebleau, FR
Mangalam S Nair · Thrissur, IN
Kokkuvayil V Radhakrishnan · Thrissur, IN

Key dates

Filing date	Aug 4, 2009
Grant date	Jul 10, 2012
Priority date	—
Expiry date	Sep 25, 2030

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D309/32
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Described herein are C5-C6 annelated naphthopyrans that possess at least one electron-withdrawing group. The compounds possess desirable properties such as increased fading kinetics. Also described herein are new methods for synthesizing 2H-chromenes annelated at C5-C6. The methods involve less stringent reaction conditions as well as provide increased reaction yields. The methods permit the synthesis of a wide variety of substituted naphthopyrans that can be temperature sensitive, which was not possible with previous synthetic routes.

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