Synthesis of 2-aryl-4,6-dinitrobenzo[b]thiophenes from 2,4,6-trinitrotoluene
摘要:
A method for the synthesis of previously unknown 2-aryl-4,6-dinitrobenzo[b]thiophenes and their 3-chloro derivatives has been developed based on the replacement of ortho-NO2 in (E)-2,4,6-trinitrostilbenes on treatment with PhCH2SH/K2CO3 followed by transformations of the resulting 2-benzylthio-4,6-dinitrostilbenes by treatment with SO2Cl2.
Synthesis of Polynitrostilbenes from 2,4,6-Trinitro-<i>M</i>-Xylene and 2,4,6-Trinitrotoluene by a Microwave-Assisted Solvent Free Method
作者:Junhui Xu、Fangmei Li、Jianping Wei、Xinhua Peng
DOI:10.3184/174751914x13944453321075
日期:2014.4
A microwave-assisted method for the synthesis of polynitrostilbenes involving the condensation of 2,4,6-trinitro-m-xylene and 2,4,6-trinitrotoluene with aryl aldehydes in the presence of piperidine and silica-gel is reported. Compared with conventional methods, a shorter reaction time is required and this method has a lower environmental impact. A mechanism for the reaction is also proposed and supported
Nucleophilic replacement of the nitro group in E-2,4,6-trinitrostilbenes by O- and S-nucleophiles. Synthesis of 2-aryl-4-X-6-nitrobenzo[b]thiophenes
作者:O. Yu. Sapozhnikov、V. V. Mezhnev、M. D. Dutov、V. V. Kachala、N. A. Popov、S. A. Shevelev
DOI:10.1007/s11172-005-0309-1
日期:2005.3
nucleophilic substitution for the nitrogroup in E-2,4,6-trinitrostilbenes under the action of arene- and alkanethiols or phenols in the presence of inorganic bases was studied. Products of o-NO2 groupreplacement in the presence of PhCH2SH were used to obtain earlier unknown 2-aryl-4,6-dinitrobenzo[b]thiophenes and their 3-chloro derivatives. In these fused heterocycles, the 4-NO2 group can be selectively displaced
efficient methodology for bromination of polynitro stilbenes using molecularbromine as brominatingagent over ZnO/H-beta-25 has been developed, which is conducted under mild condition, in good to high yield with excellent regio- and chemo-selectivities. Preliminary mechanistic studies have shown that this reaction most likely occurs via a noncovalent binding of molecularbromine to benzene ring involving