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
A new regioselective route to 2-ethoxycarbonylmethyl- 1,2-dihydro-N-methylquinolines and 1-ethoxycarbonylmethyl-1,2-dihydro-N-methylisoquinolines is described starting from methylquinolinium or -isoquinolinium iodides and commercially available ethyltrimethylsilyl acetate (ETSA). The methylene carbanion was generated by fluorodesilylation using caesium fluoride. On exposure to air, the ethoxycarbonylmethyl adducts were oxidised, leading to the corresponding alkylidene derivatives 4 and 5, whereas 2a in solution led slowly to its regioisomer 6a.
v.Braun; Seemann; Schultheiss, Chemische Berichte, 1922, vol. 55, p. 3809
作者:v.Braun、Seemann、Schultheiss
DOI:——
日期:——
Beattie, American Chemical Journal, 1908, vol. 40, p. 426
作者:Beattie
DOI:——
日期:——
Regioselective Reductive 2-Oxoalkylation of <i>N</i>-methylquinolinium and -isoquinolinium Iodides under Sonochemical Activation