Dinaphtazepinium salts useful as enantioselective epoxidation catalysts
US6063920A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1998 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Jun 1, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D223/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A compound of formula (Ia) of (Ib), wherein A and B each independently represents hydrogen or one, two or three naphthylidene substituents, which substituents are selected from C.sub.1-6 alkyl, C.sub.1-6 alkoxy, aryl, aryloxy, silyl and silyloxy; R.sup.1 represents phenyl, C.sub.1-6 alkyl, phenyl C.sub.1-6 alkyl or a moiety of formula (a): wherein R.sup.2 represents C.sub.1-6 alkyl, phenyl or benzyl, R.sup.3 represents H or OR.sup.4 wherein R.sup.4 is C.sub.1-6 alkyl or C.sub.1-6 alkylsilyl and n is zero or an integer 1 or 2; and X.sup.- is a counter ion; a process for the preparation of such compounds and the use of such compounds for enantioselectively epoxidising a prochiral olefin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.