Gold-catalyzed [4+3]- and [4+2]-annulations of 3-en-1-ynamides with isoxazoles via novel 6π-electrocyclizations of 3-azahepta trienyl cations was written by Giri, Sovan Sundar;Liu, Rai-Shung. And the article was included in Chemical Science in 2018.Recommanded Product: 5765-44-6 This article mentions the following:
New gold-catalyzed [4+3]-annulations of 3-en-1-ynamides with isoxazoles afforded 4H-azepines efficiently; this process involved 6π electrocyclizations of gold-stabilized 3-azaheptatrienyl cations. In the presence of Zn(OTf)2, the resulting 4H-azepines underwent skeletal rearrangement to furnish substituted pyridine derivatives Subsequently a new catalytic [4+2]-annulations was developed between the same 3-en-1-ynamides and isoxazoles to deliver substituted pyridine products using Au(I)/Zn(II) catalysts. The first success of the 6π electrocyclizations of heptatrienyl cations that were unprecedented in literature reports were presented. In the experiment, the researchers used many compounds, for example, 5-Methylisoxazole (cas: 5765-44-6Recommanded Product: 5765-44-6).
5-Methylisoxazole (cas: 5765-44-6) belongs to isoxazole derivatives. Isoxazoles also form the basis for a number of drugs, including the COX-2 inhibitor valdecoxib (Bextra) and a neurotransmitter agonist AMPA. As with isoxazolines, isoxazoles may be cleaved using low-valent titanium obtained from the Kulinkovich reaction.This procedure affords enaminoketones from 2,4-substituted isoxazoles.Recommanded Product: 5765-44-6
Referemce:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem