Process of making α-aminooxyketone/α-aminooxyaldehyde and α-hydroxyketone/α-hydroxyaldehyde compounds and a process of making reaction products from cyclic α, β-unsaturated ketone substrates and nitroso substrates
US8372985B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2012 |
| Grant date | Feb 12, 2013 |
| Priority date | — |
| Expiry date | Aug 3, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2601/14
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention is directed to a process of making α-aminooxyketone and α-hydroxyketone compounds. The synthetic pathway generally involves reacting an aldehyde or ketone substrate and a nitroso substrate in the presence of a catalyst of the formula (IV):wherein Xa-Xc represent independently nitrogen, carbon, oxygen or sulfur and Z represents a 4 to 10-membered ring with or without a substituent and optionally a further step to convert the α-aminooxyketone compound formed to the α-hydroxyketone compound. The present invention results in α-aminooxyketone and α-hydroxyketone compounds with high enantioselectivity and high purity. The present invention is also directed to a catalytic asymmetric O-nitroso Aldol/Michael reaction. The substrates of this reaction are generally cyclic α,β-unsaturated ketone substrate and a nitroso substrate. This methodology generally involves reacting the cyclic α,β-unsaturated ketone substrate and the nitroso substrate in the presence of a proline-based catalyst, to provide a heterocyclic product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.