bond participation in annulation to pyridines usingN,N-dimethylformamide (DMF) as the N1 and C4 synthons has been carried out. In this reaction, DMF contributed one N atom and one C atom to two disconnected positions of pyridine ring, with no need for an additional nitrogen source. Two C═C bonds in two molecules of substituted styrenes offered four carbon atoms in the presence of iodine and persulfate
Iron-Mediated One-Pot Synthesis of 3,5-Diarylpyridines from β-Nitrostyrenes
作者:Manda Sathish、Jadala Chetna、Namballa Hari Krishna、Nagula Shankaraiah、Abdullah Alarifi、Ahmed Kamal
DOI:10.1021/acs.joc.5b02712
日期:2016.3.4
An operationally simple and mild one-pot protocol for the synthesis of a variety of 3,5-diarylpyridines from β-nitrostyrenes was achieved by using elemental iron. This reaction proceeds via reduction of the nitro group, resulting in in situimine formation followed by trimolecular condensation with concomitant debenzylative aromatization. By employing this method, a series of symmetrical and unsymmetrical
Molecular Iodine-Mediated Chemoselective Synthesis of Multisubstituted Pyridines through Catabolism and Reconstruction Behavior of Natural Amino Acids
作者:Jia-Chen Xiang、Miao Wang、Yan Cheng、An-Xin Wu
DOI:10.1021/acs.orglett.5b03037
日期:2016.1.4
A new process has been developed for the selective construction of 2,6-disubstituted, 2,4,6-trisubstituted, and 3,5-disubstituted pyridines based on the catabolism and reconstruction behaviors of amino acids. Molecular iodine was used as a tandem catalyst to trigger the decarboxylation deamination of amino acids and to promote the subsequent formation of the pyridine products.