Many biologically active nicotinonitriles have been reported to date. Consequently, the development of synthetic methods for multiply arylated/alkylated nicotinonitriles remains a sought-after field of research. In the present work, a new synthetic strategy for multi-substituted nicotinonitriles is described. A FeCl3-promoted condensation–cyclization reaction of an enamino nitrile and α,β-unsaturated
NaOH-Promoted Chemoselective Cascade Cyclization of Cyclopropyl Esters with Unsaturated Imines: Access to Bioactive Cyclopenta[c]pyridine Derivatives
作者:Dingwu Pan、Chengli Mou、Ningning Zan、Ya Lv、Bao-An Song、Yonggui Robin Chi、Zhichao Jin
DOI:10.1021/acs.orglett.9b02088
日期:2019.9.6
A chemoselective cascade cycloaddition reaction is developed for green and efficient access to cyclopenta[c]pyridine derivatives. Simple and inexpensive NaOH is used as the sole catalyst for this process. The δ-carbon of cyclopropyl ester is activated as a nucleophilic carbon to initiate highly chemoselective cascade reactions. Cyclopenta[c]pyridines bearing various substituents are afforded in excellent
Tandem Copper(I)‐Catalyzed
<i>N</i>
‐Arylation–1,4‐Conjugate Addition to Access Tetrahydroacridinones
作者:Jyoti M. Honnanayakanavar、Purna Chandra Behera、Surisetti Suresh
DOI:10.1002/adsc.202200877
日期:2022.12.8
copper-catalyzed tandem process integrating N-arylation and 1,4-conjugate addition is disclosed through the reaction of cyclic enaminones and ortho-halochalcones. The reaction appears to proceed through chemoselective arylation on the nitrogen of enaminone with ortho-halochalcones and Michael addition of α-carbon of the enaminone to the chalcone to furnish a diverse range of tricyclic tetrahydroacridinone derivatives
Visible light mediated, photocatalyzed energy transfer for the atom economical synthesis of a diverse range of oxygen-bridged tricyclo-fused cyclopropane derivatives in moderate to high yields is disclosed.