Ruthenium-Catalyzed Conversion of sp3 C–O Bonds in Ethers to C–C Bonds Using Triarylboroxines
摘要:
Catalytic conversion of unreactive sp(3) C-O bonds in alkyl ethers to C-C bonds is described. Alkyl ethers bearing 2- or 4-pyridyl groups were coupled with triarylboroxines in the presence of a ruthenium catalyst. Triarylboroxines bearing a variety of functional groups including electron-withdrawing and -donating groups can be used for the reaction. No additional base was required for the coupling with the organoboron reagents, and base-sensitive groups can be tolerated. The reaction is considered to proceed via dehydroalkoxylation followed by addition of triarylboroxines to form C-C bonds.
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
Manganese catalyzed C-alkylation of methyl <i>N</i>-heteroarenes with primary alcohols
作者:Akash Jana、Amol Kumar、Biplab Maji
DOI:10.1039/d1cc00181g
日期:——
C-Alkylations of nine different classes of methyl-substituted N-heteroarenes, including quinolines, quinoxalines, benzimidazoles, benzoxazoles, pyrazines, pyrimidines, pyridazines, pyridines, and triazines are disclosed. A bench stable earth-abundant Mn(I)-complex catalyzed the chemoselective hydrogen-transfer reaction utilizing a diverse range of primary alcohols as the non-fossil fuel-derived carbon
Ligand-Free RuCl<sub>3</sub>-Catalyzed Alkylation of Methylazaarenes with Alcohols
作者:Tong-Yu Feng、Hong-Xi Li、David James Young、Jian-Ping Lang
DOI:10.1021/acs.joc.6b03095
日期:2017.4.21
RuCl3 efficiently catalyzes the alkylation of methylquinolines, methylpyridines, 2-methyl-benzooxazoles, and 2-methyl-quinoxalines with alkyl- or aryl-alcohols as alkylating agents. This synthetically useful and atom economical transformation does not require additional ligands. The mechanistic study indicated the alkylation reaction underwent a stepwise transfer hydrogenation, aldol condensation,
[EN] SUBSTITUTED ACETYLENE DERIVATIVES AND THEIR USE AS POSITIVE ALLOSTERIC MODULATORS OF MGLUR4<br/>[FR] DÉRIVÉS D'ACÉTYLÈNE SUBSTITUÉS ET LEUR UTILISATION À TITRE DE MODULATEURS ALLOSTÉRIQUES POSITIFS DU MGLUR4
申请人:MERCK PATENT GMBH
公开号:WO2014121883A1
公开(公告)日:2014-08-14
The present invention relates to novel acetylene derivatives as positive allosteric modulators for modulating metabotropic glutamate receptor subtype 4 (mGluR4) and/or altering glutamate level or glutamatergic signalling.
Skeletal editing through direct nitrogen deletion of secondary amines
作者:Sean H. Kennedy、Balu D. Dherange、Kathleen J. Berger、Mark D. Levin
DOI:10.1038/s41586-021-03448-9
日期:2021.5.13
dinitrogen, producing short-lived diradicals that rapidly couple to form the newcarbon–carbonbond. The reaction shows broad functional-group tolerance, which enables the translation of routine amine synthesis protocols into a strategy for carbon–carbonbond constructions and ring syntheses. This is highlighted by the use of this reaction in the syntheses and skeletal editing of bioactive compounds.