Facile <i>N</i>-Arylation of Amines and Sulfonamides and <i>O</i>-Arylation of Phenols and Arenecarboxylic Acids
作者:Zhijian Liu、Richard C. Larock
DOI:10.1021/jo0602221
日期:2006.4.1
An efficient, transition-metal-free procedure for the N-arylation of amines, sulfonamides, and carbamates and O-arylation of phenols and carboxylicacids has been achieved by allowing these substrates to react with a variety of o-silylaryl triflates in the presence of CsF. Good to excellent yields of arylated products are obtained under very mild reaction conditions. This chemistry readily tolerates
A New Flow Methodology for the Expedient Synthesis of Drug‐Like 3‐Aminoindolizines
作者:Paul P. Lange、Andrew R. Bogdan、Keith James
DOI:10.1002/adsc.201200316
日期:2012.9.17
A flow‐based synthesis of diversely functionalized indolizines and their aza‐analogues is described. These drug‐like heterocycles were generated via a tandem Sonogashira/cycloisomerization sequence, starting from widely available 2‐bromopyridines and alkynes, employing a simple catalyst system together with 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) as base. The use of flow technology allows a straightforward
Synthesis of 2-Indolyltetrahydroquinolines by Zinc(II)-Catalyzed Intramolecular Hydroarylation-Redox Cross-Dehydrogenative Coupling of <i>N</i>
-Propargylanilines with Indoles
作者:Guangzhe Li、Hiroyuki Nakamura
DOI:10.1002/anie.201602416
日期:2016.6.1
An intramolecular hydroarylation‐redox cross‐dehydrogenativecoupling (CDC) of propargylic anilines with indoles proceeded in the presence of zinc(II) catalysts to give 2‐indolyltetrahydroquinolines in good to high yields. Three C−H bonds (two sp2 and one sp3) are activated in one shot and these hydrogen atoms are trapped by a propargylic triple bond in the molecule.
Titanocene(II)-promoted cross-coupling between (Z)-alkenyl methyl sulfones and terminal allenes produced 1,4-dienes regioselectively via the formation of 2-alkylidenetitanacyclopentanes. Preferential formation of E,Z-dienes was observed in the reaction using aryl-, amino-, and phosphinylallenes.
Zinc(<scp>ii</scp>)-catalyzed intramolecular hydroarylation-redox cross-dehydrogenative coupling of<i>N</i>-propargylanilines with diverse carbon pronucleophiles: facile access to functionalized tetrahydroquinolines
Redox cross-dehydrogenative coupling ofN-propargylanilines with diverse carbon pronucleophiles offers a general and efficient synthetic method to construct functionalized tetrahydroquinolines.