Atroposelective Arene Formation by Carbene‐Catalyzed Formal [4+2] Cycloaddition
作者:Ke Xu、Wenchang Li、Shaoheng Zhu、Tingshun Zhu
DOI:10.1002/anie.201910049
日期:2019.12.2
Atroposelective arene formation is an efficient method to build axially chiral molecules with multi-substituted arenes. Reported here is an organocatalyzed atroposelective arene formationreaction by an N-heterocyclic carbene (NHC) catalyzed formal [4+2] cycloaddition of conjugated dienals and α-aryl ketones. This study expands the synthetic potential of NHC organocatalysis and provides a competitive
Copper-catalyzed addition of water affording highly substituted furan and unusual formation of naphthofuran ring from 3-(1-alkenyl)-2-alkene-1-al
作者:Rathin Jana、Sunanda Paul、Anup Biswas、Jayanta K. Ray
DOI:10.1016/j.tetlet.2009.10.125
日期:2010.1
We have developed a novel one-pot reaction to generate highly substituted furan through the addition of water followed by oxidation and unusual cyclization to naphthofuran ring under the same reaction condition.
Palladium-Catalyzed Intramolecular Oxidative Heck Cyclization and Its Application toward a Synthesis of (±)-β-Cuparenone Derivatives Supported by Computational Studies
oxidative cyclization of substituted homoallylic alcohols to form cyclic keto compounds under palladium-catalyzed conditions is described. The reaction has practical applications in the synthesis of sesquiterpenes. The mechanism of cyclization, the key step in the tandemreaction, was analyzed by using density functional theory calculations. A novel and efficient intramolecular oxidative cyclization of substituted
Pd-catalyzed intramolecular sequential Heck cyclization and oxidation reactions: a facile pathway for the synthesis of substituted cycloheptenone evaluated using computational studies
作者:Jayanta K. Ray、Sunanda Paul、Paramita Ray、Raju Singha、Davuluri Yogeswara Rao、Surajit Nandi、Anakuthil Anoop
DOI:10.1039/c6nj02694j
日期:——
the construction of substituted cycloheptenones from 1-bromoocta-1,7-diene-3-ols has been developed. The reaction involves Pd(0)-catalyzed intramolecular 7-exo-trig cyclization followed by Pd(II)-catalyzed oxidation of cyclic alcohol. The course of the reaction pathway has been evaluated using DFT calculations.
Copper catalyzed synthesis of highly substituted pyrrole and isoindole derivatives
作者:Sukla Nandi、Jayanta K. Ray
DOI:10.1016/j.tetlet.2011.09.070
日期:2011.11
We have developed an efficient synthesis of highly substituted pyrrole and isoindole derivatives using copper(I) catalyst. This methodology is helpful for the synthesis of some quinones bearing annealed N-heterocyclic natural products.