Derivatives of tricycloquinazoline and methods for their preparation
US5274092A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 13, 1992 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Jul 13, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D487/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel discogens based on tricycloquinazoline derivatives and methods for their preparation are described. One method for their preparation is to nitrate veratraldehyde and after reducing the resulting nitrate to dimethoxy anthranil to obtain its trimerization thus producing a trisubstituted tricycloquinazoline. Another method is to start with dichlorotoluene and after its nitration to oxidize the nitrate into dichloronitrodiacetoxytoluene, its hydrolysis into benzaldehyde followed by a partial reduction to anthranil and finally by the trimerization of the anthranil to obtain the hexachlorotricycloquinazoline. The novel compounds are useful as fluorescent indicators for high performance oxygen sensors, organic conductors, liquid crystals and polymeric liquid crystals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.