5-fluoro-and 8-fluoro-trimetoquinol compounds and the processes for their preparation
US4737504A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1986 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Jul 25, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D217/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to novel 5-fluoro- and 8-fluoro-trimetoquinol compounds of the general formula I wherein X.sub.1 =F,X.sub.2 =H or X.sub.1 =H,X.sub.2 =F ##STR1## The present invention also relates to a process for making the 5-fluoro- and 8-fluoro-trimetoquinol compounds by condensation of an appropriately substituted phenethylamine to afford an appropriately substituted phenethylacetamide compound. The amides are cyclized to give appropriately substituted intermediate dihydroisoquinolines. Without isolation, the dihydroisoquinolines are reduced to give appropriately substituted tetrahydroisoqinolines. The hydrochloride salts of tetrahydroisoqinolines are prepared and subjected to hydrogenolysis, to give the fluorine substituted trimetoquinol compounds of the present invention. The present invention also encompasses the preparation of the phenethylamines by reducing appropriately substituted benzylcyanides and to the preparation of an intermediate benzylcyanide compound by converting a fluorine substituted methoxyphenol compound, under aminomethylation conditions into a N, N-dimethyl-4-hydroxy-3-methoxy-5-fluorobenzylamine. The benzylamine is converted to benzylnitrile…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.