A method of producing an aromatic compound of the following formula (3) comprising reacting a compound of the following formula (1) with an olefin compound of the following formula (2) in the presence of a transition metal complex:
(wherein, an Ar
1
ring represents an aromatic hydrocarbon ring or aromatic heterocyclic ring, an Ar
2
ring represents a heterocyclic ring containing X
1
and N*, and the X
1
represents a nitrogen atom or carbon atom and the N represents a nitrogen atom connecting via a double bond to either one of two adjacent atoms in the Ar
2
ring.)
(wherein, R
1
, R
2
, R
3
and R
4
represent each independently a hydrogen atom, an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 18 carbon atoms.)
(wherein, Ar
1
, Ar
2
, X
1
, N*, R
1
, R
2
and R
3
represent the same meanings as described above.).
Aromatic and olefinic C-H alkenylation by catalysis with spirocyclic NHC Ru(IV) pincer complex
作者:Heng Cai、Yong-Qiang Tu、Ka Lu、Qi-Long Chen、Fu-Min Zhang、Xiao-Ming Zhang、Yuan-Jiang Pan、Zhi-Bo Yan
DOI:10.1007/s11426-022-1541-5
日期:2023.10
Catalyst innovation lies at the heart of transition-metal-catalyzed reaction development. In this article, we have explored the C(sp2)—H alkenylation activity with novel spirocyclic N-heterocyclic carbene (NHC)-based cyclometalated ruthenium pincer catalyst system, SNRu-X. After screening catalyst and condition, a high valent Ru(IV) dioxide (X = O2) species has demonstrated superior reactivity in the
The regioselective Ru(cod)(cot)-catalyzed alkenylation of arylpyridines and related compounds with alkenyl acetates to give good-to-excellent yields of ortho-alkenylation products was developed. Several arylpyridines having electron-donating (CH3 and OCH3) and -withdrawing (CF3, CN, and Ac) groups and azoles, such as oxazoline, tetrazole, and thiazole, can be used in this coupling reaction. A variety of alkenyl acetates, such as 1-propenyl, 1-butenyl, 1-hexenyl, styryl, 2-methyl-1-propenyl, and 1-cyclohexenyl acetates, reacted with arylpyridines to give the corresponding ortho-alkenylation products in high yields. This direct alkenylation of aromatic C-H bonds with alkenyl acetates provides pi-conjugated aromatic and heteroaromatic compounds under halogen-free reaction conditions.
US8212048B2
申请人:——
公开号:US8212048B2
公开(公告)日:2012-07-03
Ruthenium-Catalyzed Ortho-Selective C–H Alkenylation of Aromatic Compounds with Alkenyl Esters and Ethers
elimination. Two types of catalytically relevant species were identified, and the reactivities of these species, combined with the results of the kinetic studies, suggest that the rate-limiting step is the exchange of the COD ligand with the alkenyl ester. On the basis of the elucidated mechanism, the first catalytic coupling reaction using aromatic C–H bonds with C–O bonds of ethers was also developed