Manganese(III) Porphyrin‐Catalyzed Dehydrogenation of Alcohols to form Imines, Tertiary Amines and Quinolines
作者:Kobra Azizi、Sedigheh Akrami、Robert Madsen
DOI:10.1002/chem.201900737
日期:2019.5.2
Manganese(III) porphyrin chloride complexes have been developed for the first time as catalysts for the acceptorless dehydrogenative coupling of alcohols and amines. The reaction has been applied to the direct synthesis of imines, tertiary amines and quinolines where only hydrogen gas and/or water are formed as the by‐product(s). The mechanism is believed to involve the formation of a manganese(III) alkoxide
Methyl-phenyl derivatives, preparation method and use
申请人:Sanofi-Synthelabo
公开号:US06417400B1
公开(公告)日:2002-07-09
The present invention relates to:
a) methylbiphenyl derivatives of general formula:
in which R1 represents OH, C3-C7 alkyl or C3-C7 cycloalkyl, these compounds being in the form of individual isomers or mixtures thereof,
b) their preparation by reaction:
either of a hydroxylamine salt with an N-substituted o-(p-tolyl)benzaldimine, to give o-(p-tolyl)benzaldoxime
or of an N-substituted 2-halobenzaldimine with a p-tolylmagnesium halide in the presence of an inorganic manganese derivative, to give the compounds of formula I in which R1 represents C3-C7 alkyl or C3-C7 cycloalkyl
c) their use for the preparation of o-(p-tolyl)-benzonitrile, which is an intermediate in the synthesis of medicinal products.
NHC-Copper Mediated Ligand-Directed Radiofluorination of Aryl Halides
作者:Liam S. Sharninghausen、Allen F. Brooks、Wade P. Winton、Katarina J. Makaravage、Peter J. H. Scott、Melanie S. Sanford
DOI:10.1021/jacs.0c02637
日期:2020.4.22
which the C(sp2)-18F bond is formed via a copper-mediated pathway. Copper N-heterocyclic carbene complexes serve as mediators for this transformation, using aryl halide substrates with directing groups at the ortho position. This reaction is applied to the radiofluorination of electronically diverse aryl halide derivatives, including the bioactive molecules vismodegib and PH-089.
Vanadium- and Chromium-Catalyzed Dehydrogenative Synthesis of Imines from Alcohols and Amines
作者:Yulong Miao、Simone V. Samuelsen、Robert Madsen
DOI:10.1021/acs.organomet.1c00123
日期:2021.5.10
Vanadium(IV) tetraphenylporphyrin dichloride and chromium(III) tetraphenylporphyrin chloride have been developed as catalysts for the acceptorless dehydrogenation of alcohols. The catalysts have been applied to the direct synthesis of imines in overall good yields from a variety of alcohols and amines. The transformations are proposed to proceed by metal–ligand bifunctional pathways with an outer-sphere
As electron-rich partners, they act as 4π phosphadienic systems toward alkenes and alkynes in [4 + 2] cycloaddition reactions. As electron-poor partners, they act either as 2π systems toward conjugated dienes in [2 + 4] cycloaddition reactions via their P═C double bond or as 6π systems toward phosphadienes in [6 + 4] cycloaddition reactions.