An efficient synthesis of quinolines, pyrimidines, quinoxalines, pyrroles, and aminomethylated aromatic compounds catalyzed by a well-defined Re(I) PNP pincer complex is described. All reactions proceed with liberation of dihydrogen and elimination of water. Under optimized reaction conditions a wide range of organic functional groups are tolerated. This study demonstrates that rhenium catalysts are
Palladium-Catalyzed Amino-Heck Reaction of γ,δ-Unsaturated Ketone <i>O</i>-Diethylphosphinyloximes: A New Synthesis of Substituted Pyrroles and Indoles
作者:Jia-Liang Zhu*、Yu-Hui Chan
DOI:10.1055/s-2008-1072728
日期:2008.5
starting materials for the intramolecular amino-Heck reactions. In the presence of a catalytic amount of Pd(PPh 3 ) 4 in DBU, cyclization reactions occurred preferentially via a 5- EXO fashion to afford a variety of 2-substituted 5-methyl-1 H-pyrroles and several indolederivatives in moderate to high yields.
A highlyenantioselective Pd-catalyzed partial hydrogenation of simple 2,5-disubstituted pyrroles with a Brønsted acid as an activator has been successfully developed, providing chiral 2,5-disubstituted 1-pyrrolines with up to 92% ee.
A Method for Pyrrole Synthesis through Intramolecular Cyclization of γ-Alkynyl Oximes Promoted by SmI2
作者:Songlin Zhang、Yiqiong Wang、Lingyu Zhang
DOI:10.1055/a-1932-5749
日期:2022.12
A new strategy for the synthesis of pyrrole through intramolecular cyclization of γ-alkynyl oximes promoted by SmI2 is reported for the first time. In contrast to the prior methods, the selection of oxime instead of oximeether or ester as substrate makes the synthetic method without accompaniment of organic waste (ArCO2H, AcOH, or ROH) because the hydroxyl group in oxime acts as the leaving group
Molybdenum-based efficient and broadly applicable catalytic system is presented for the dehydrogenative coupling of γ-/β-aminoalcohols with ketones. In particular, complex Mo(CO)6 in combination with Xantphos and t-BuOK as base provides directsynthesis of structurally diverse quinoline, pyridine, and pyrrole compounds (total 55 examples) with isolated yields up to 92%. Low catalyst loading, cost-effective