Convenient synthesis of 4-nitrotetralones by selective side-chain nitration of methyl-substituted acryloylbenzenes, followed by intramolecular Michael reaction
Reaction of polymethyl-substituted acryloylbenzenes (1) with fuming nitric acid in acetic anhydride gave the products (2) derived from selectiveside-chainnitration at the ortho-position; the subsequent intramolecularMichaelreaction leads to exclusive formation of 4-nitrotetralones (3).
Evolution of the Dearomative Functionalization of Activated Quinolines and Isoquinolines: Expansion of the Electrophile Scope
作者:Marvin Kischkewitz、Bruno Marinic、Nicolas Kratena、Yonglin Lai、Hamish B. Hepburn、Mark Dow、Kirsten E. Christensen、Timothy J. Donohoe
DOI:10.1002/anie.202204682
日期:2022.7.4
Reductive functionalisation of quinolinium and isoquinolinium salts with formic acid as the terminal reductant was possible under transition-metal-free conditions or rhodium catalysis with very low catalyst loadings. A wide range of electrophiles, including enones, imides, unsaturated esters and sulfones, β-nitrostyrenes and aldehydes, were intercepted by the enamine species formed in situ to generate