29670-64-2Relevant articles and documents
RING CLEAVAGE AND RING EXPANSION OF INDOLES BY SUPEROXYDE ION
Balogh-Hergovich, E.,Speier, G.
, p. 4473 - 4476 (1982)
The reaction of indoles (1) with superoxide ion resulted in ring cleavage to give o-formyl and o-acylaminoketones (6) or N-acylanthranilic acid (8) and ring expansion yielding 2-quinolones (7).All reactions are chemiluminescent except that of 2-methylindole (1h), which gave a coupled product (9).
N-Heterocyclic Carbene/Cobalt Cooperative Catalysis for the Chemo- and Regioselective C?N Bond Formation between Aldehyde and Amines/Amides
Siddiqui, Asher M.,Khalid, Anam,Khan, Arif,Azad, Chandra S.,Samim, Mohd.,Khan, Imran A.
, p. 4281 - 4287 (2020/07/24)
A novel methodology for the construction of various secondary (4 examples), tertiary amides (31 examples), and imides (16 examples) by a Cobalt(II) catalyzed oxidative amide coupling in aqueous media. The Co(III)-TMC was reacted with N-Heteroatom Carbene to form active catalyst Co(II)NHC-TMC in situ which involves in the coordination with Breslow's intermediate and SET for the activation of aldehyde and amides. The mechanism for activation of amide and amine differs on the basis of SET based nucleophilic addition and ligand exchange respectively. The regeneration of the catalyst was achieved using Fe(III)(EDTA)-H2O2 as oxidant. The use of Co(II)TMC-O2 was also found equally efficient in the process. The method is found regioselective for N?H activation in the presence of equally susceptible ortho-C?H bond activation. And amines were found more susceptible then the corresponding amide for the reaction.
Efficient Friedel–Crafts benzoylation of aniline derivatives with 4-fluorobenzoyl chloride using copper triflate in the synthesis of aminobenzophenones
Tran, Phuong Hoang,Phung, Huy Quang,Hansen, Poul Erik,Tran, Hai Ngoc,Le, Thach Ngoc
, p. 893 - 901 (2016/07/06)
ABSTRACT: An efficient pathway for the synthesis of the aminobenzophenone derivatives via Friedel–Crafts benzoylation using copper triflate as catalyst is proposed. New derivatives are synthesized. The copper triflate could be easily recovered and reused without loss of catalytic activity. Both the use of ionic liquids and microwave heating turned out to be fruitful.