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.
A metal-free cascade reaction strategy has been developed for the synthesis of novel polycyclic 2-formylthiophenes from β-halo-α,β-unsaturatedaldehydes and 1,4-dithiane-2,5-diol. Recyclable polymer supported organic base was used to perform the reaction process. This synthetic protocol was applied to synthesize several novel polycyclic thiophenes including steroidal D-ring annelated thiophene. Our
Construction of [2,5]-Furanophanes by Carbene-Mediated Alkynyl Migration Cyclization
作者:Qiu Shi、Yang Chen、Tongxiang Cao、Shifa Zhu
DOI:10.1021/acs.orglett.2c03185
日期:2022.11.11
Heterophanes are widely found in natural products and drug molecules. Herein, an efficient method for the construction of [2,5]-furanophanes with differentring types and ringsizes was developed. This method is carried out with furan-free precursor throughintramolecular carbene-mediated alkynyl migration and tandem cyclization strategy. In addition, a series of tetrafuran structures can be obtained by oxidative
A modular approach toward the synthesis of 2,4-disubstituted pyridines
作者:Raju Singha、Shubhendu Dhara、Jayanta K. Ray
DOI:10.1016/j.tetlet.2013.06.092
日期:2013.9
A number of 2,4-disubstituted pyridines have been synthesized using alpha,beta,gamma,delta-unsaturated aldehydes and ammonium chloride in the presence of triethylamine in acetonitrile solvent at 80 degrees C under air balloon. (C) 2013 Elsevier Ltd. All rights reserved.