Palladium‐Catalyzed Regioselective Dehydrogenative C–H/C–H Cross‐Coupling of Pyrroles and Pyridine
<i>N</i>
‐Oxides
作者:Shanshan Liu、C. Christoph Tzschucke
DOI:10.1002/ejoc.201600680
日期:2016.7
The palladium-catalyzed cross-dehydrogenative coupling of N-alkylpyrroles and pyridine N-oxides gave the corresponding pyrrolylpyridine N-oxides. Cu(OAc)2·H2O as a co-catalyst with air as the terminal oxidant led to preferential coupling in the β-position, whereas AgOAc as the stoichiometric oxidant resulted in preferential coupling in the α-position. N-(Benzyloxymethyl)pyrrole derivatives were deprotected
substituted heteroarenes in nature and bioactive compounds. Some substitution patterns remain challenging: While highly efficient methods for the C2‐selective olefination of 3‐substituted five‐membered heteroarenes have been reported, analogous methods to access the 5‐olefinated products have remained limited by poor regioselectivities and/or the requirement to use an excess of the valuable heteroarene starting
A process for producing a conductive polymer film, which comprises preparing a homogeneous, stable precursor solution containing an aromatic compound such as pyrrole, thiophene, aromatic amine or a derivative thereof, an oxidizing agent and a solvent and not immediately causing polymerization, and casting the precursor solution onto a base material to obtain uniform and touch conductive polymer film upon removal of the solvent by evaporation.