The first base-metal catalysed coupling of primary alcohols with methyl-N-heteroaromatics is reported. The use of an earth abundant and nonprecious NiBr2/L1 system enables access to a series of C(sp3)-alkylated N-heteroaromatics. Mechanistic studies have established the participation of a hydrogen-borrowing strategy for α-alkylation.
Expeditious preparation of 2-substituted quinolines
作者:Mohamed A Fakhfakh、Xavier Franck、Alain Fournet、Reynald Hocquemiller、Bruno Figadère
DOI:10.1016/s0040-4039(01)00604-9
日期:2001.6
A library of 2-substituted quinolines was synthesized in solution from mixtures of Grignard reagents and a quinolinium salt. Grignard reagents were prepared in one pot, taking advantage of the entrainment method for their preparationfrom unreactive alkyl halides. Then mixtures of 2-alkylquinolines were readily accessible for biological tests or separated by centrifugal-partition chromatography (CPC)
Iridium-Catalyzed Alkylation of Methylquinolines with Alcohols
作者:Yasushi Obora、Shinji Ogawa、Nobuyuki Yamamoto
DOI:10.1021/jo3019347
日期:2012.10.19
Iridium-catalyzed alkylation of methylquinolines at the methyl substituent was achieved using alcohols as alkylating agents. The reaction proceeded through a transfer hydrogenation pathway from the alcohol to the Ir complex, affording an aldehyde and Ir-H species, followed by base assisted aldol condensation and hydrogenation. This method provides an atom-economical and convenient route to alkylquinolines from easily accessible methylquinolines.
Krafft, Chemische Berichte, 1890, vol. 23, p. 2363
作者:Krafft
DOI:——
日期:——
Iron-catalysed alkylation of 2-methyl and 4-methyl azaarenes with alcohols <i>via</i> C–H bond activation
The first Fe-catalysed alkylation of 2-methyl and 4-methyl-azaarenes with a series of alkyl and hetero-aryl alcohols is reported (>39 examples and up to 95% yield). Multi-functionalisation of pyrazines and synthesis of anti-malarial drug (±) Angustureine significantly broaden the scope of this methodology. Preliminary mechanistic investigation, deuterium labeling and kinetic experiments including trapping