Cyclization process utilizing copper aluminum borate as a catalyst
US5332838A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1988 |
| Grant date | Jul 26, 1994 |
| Priority date | — |
| Expiry date | Mar 29, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D307/79
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is a cyclization process utilizing the catalyst copper aluminum borate which process comprises the step of contacting (1) a compound having a fragment in which a carbon-containing chain of at least three atoms in sequence is bonded at one end thereof to a nitrogen, oxygen, or sulfur atom, and at the opposite end to a carbon, nitrogen, oxygen, or sulfur atom, where the latter are bonded to at least one hydrogen atom; with (2) a catalyst comprising at least one member selected from the group consisting of copper aluminum borate and zero valent copper on a support comprising aluminum borate, under conditions sufficient to effect ring closure between the ends of the fragment to obtain a compound comprising a heterocyclic ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.