A manganese-catalyzed cross-coupling reaction of heterocyclic chlorides with aryl- as well as alkylmagnesium halides has been developed. The reaction provides a variety of heterocyclic compounds under mild and practical reaction conditions using low amounts of manganese chloride as catalyst.
Copper-Catalyzed Coupling of Triaryl- and Trialkylindium Reagents with Aryl Iodides and Bromides through Consecutive Transmetalations
作者:Surendra Thapa、Santosh K. Gurung、Diane A. Dickie、Ramesh Giri
DOI:10.1002/anie.201407586
日期:2014.10.20
An efficient copper(I)‐catalyzed coupling of triaryl and trialkylindium reagents with aryl iodides and bromides is reported. The reaction proceeds at low catalyst loadings (2 mol %) and generally only requires 0.33 equivalents of the triorganoindium reagent with respect to the aryl halide as all three organic nucleophilic moieties of the reagent are transferred to the products through consecutive transmetalations
The present disclosure relates to compounds of Formula (I) or (II), which inhibit Gal-3, and include pharmaceutically acceptable salts, compositions comprising such compounds, and methods using and making such compounds and compositions.
Ligand-Free Copper-Catalyzed Negishi Coupling of Alkyl-, Aryl-, and Alkynylzinc Reagents with Heteroaryl Iodides
作者:Surendra Thapa、Arjun Kafle、Santosh K. Gurung、Adam Montoya、Patrick Riedel、Ramesh Giri
DOI:10.1002/anie.201502379
日期:2015.7.6
Reported herein is an unprecedented ligand‐free copper‐catalyzed cross‐coupling of alkyl‐, aryl‐, and alkynylzinc reagents with heteroaryl iodides. The reaction proceeds at room temperature for the coupling of primary, secondary, and tertiary alkylzincreagents with heteroaryl iodides without rearrangement. An elevated temperature (100 °C) is required for aryl–heteroaryl and alkynyl–heteroaryl couplings
Direct enantioselective access to 4-substituted tetrahydroquinolines by catalytic asymmetric transfer hydrogenation of quinolines
作者:Magnus Rueping、Thomas Theissmann、Mirjam Stoeckel、Andrey P. Antonchick
DOI:10.1039/c1ob05870c
日期:——
A convenient protocol for the enantioselective synthesis of 4-substituted tetrahydroquinolines has been developed. Chiral BINOL phosphoric acids promote the reduction of a wide range of 4-substituted quinolines with Hantzsch esters with good to high levels of enantioselectivity.