Pd(<scp>ii</scp>)-Catalyzed tandem selective dehydrogenative [4+2] annulation of 2-methyl-1,3-cycloalkanediones with olefins
作者:Xu Zhang、Di Wang、Mengfan Chang、Xuefeng Xu、Wenguang Li、Wanya Wang
DOI:10.1039/d3cc05191a
日期:——
A practical and effective palladium-catalyzed selective dehydrogenative [4+2] annulation of 2-methyl-1,3-cycloalkanediones with olefins was reported. The active 2-methylene-1,3-cycloalkanedione was in situ generated via Pd-catalyzed enolate oxidation processes, and it subsequently reacted with a wide variety of olefins to afford various polysubstituted dihydropyran derivatives in good to excellent
Diversity-oriented approach to natural product inspired pyrano-carbazole derivatives: strategic utilization of hetero-Diels–Alder reaction, Fischer indolization and the Suzuki–Miyaura cross-coupling reaction
A variety of natural products inspired pyrano-carbazole derivatives have been assembled via hetero-Diels-Alder reaction and Fischer indolization (FI) under operationally simple reaction conditions. Later, the scope of this methodology has been expanded through Suzuki-Miyaura cross-coupling reaction involving different boronic acids. This simple strategy can be useful to generate a variety of medicinally important carbazole derivatives. (C) 2015 Elsevier Ltd. All rights reserved.
A New One-Pot Procedure for
a Ring Contraction Reaction using Iodine/H<sub>2</sub>O<sub>2</sub>
作者:Vitor Ferreira、Sabrina Ferreira、Carlos Kaiser
DOI:10.1055/s-0028-1083519
日期:——
A new procedure for ring contraction from 1,2-quinones using aqueous H2O2 (30%) and catalytic amount of I2 in acetonitrile is reported.