A concise and efficient method for the synthesis of alkynyl/benzoyl-functionalized quinolines through TfOH-promoted cascade 1,4-conjugate addition/intramolecular annulation/aromatization process is established.
Selective synthesis of 2‐(5‐oxo‐1‐arylhex‐1‐yn‐3‐yl)phenyl benzoates via FeCl
<sub>3</sub>
‐mediated cascade reactions of propargylamines with
<i>β</i>
‐enamino ketones
A mild and efficient FeCl3‐mediated cascade reaction of ortho‐hydroxyl propargylamines with β‐enamino ketones has been developed. This protocol provided a practical and selective method to synthesize 2‐(5‐oxo‐1‐arylhex‐1‐yn‐3‐yl)phenyl benzoates via in situ generated alkynyl o‐quinone methides following a cascade intermolecular 1,4‐conjugate addition/intramolecular nucleophilic addition/reverse Claisen
Electrochemical Synthesis of Polysubstituted Sulfonated Pyrazoles via Cascade Intermolecular Condensation, Radical–Radical Cross Coupling Sulfonylation, and Pyrazole Annulation
作者:Jiajun Feng、Yuzhi Wang、Luoyu Gao、Yang Yu、Jonathan B. Baell、Fei Huang
DOI:10.1021/acs.joc.2c01609
日期:2022.10.7
established under metal-free, exogenous-oxidant-free, and mild conditions. By judicious choice of different electrochemical reaction conditions, NH2-functionalized enaminones or N,N-disubstituted enaminones can react with aryl/alkyl sulfonyl hydrazides to afford tetra- or trisubstituted sulfonated pyrazoles in moderate to good yields, respectively. The gram-scale electrochemical transformation demonstrated
Rongalite as C1 Synthon in the Synthesis of Divergent Pyridines and Quinolines
作者:Huan Gao、Liyun Zhou、Jie-Ping Wan、Yunyun Liu
DOI:10.1021/acs.joc.3c00428
日期:2023.6.2
Rongalite has been used as a cheap and efficient carbon synthon for the synthesis of divergent N-heteroaromatics, including different pyridines and quinolines. The selective synthesis of different products can be achieved by employing enaminones or enaminones/anilines as reaction partners. In addition, compared with the reaction using conventional aldehyde synthons, rongalite displays an evident advantage