Diethylamine Dess–Martin periodinane: an efficient catalyst–oxidant combination in a sequential, one-pot synthesis of difficult to access 2-amino-3,5-dicarbonitrile-6-sulfanylpyridines at ambient temperature
Exploring Catalyst and Solvent Effects in the Multicomponent Synthesis of Pyridine-3,5-dicarbonitriles
作者:Kai Guo、Mark J. Thompson、Beining Chen
DOI:10.1021/jo901232b
日期:2009.9.18
protocol to overcome the difficulty in the directsynthesis of pyridine-3,5-dicarbonitriles via the MCR from sterically hindered aldehydes using either base was realized by changing the reaction solvent from ethanol to acetonitrile. Mechanistically, the two catalysts were found to each promote different pathways in the final oxidation step of the penultimate product, 1,4-dihydropyridine 6. A reaction
Scandium triflate-catalyzed one-pot multi-component synthesis of 2-amino-6-thiopyridine-3,5-dicarbonitriles
作者:Shrinivas S. Kottawar、Shapi A. Siddiqui、Sudhakar R. Bhusare
DOI:10.1515/hc-2012-0103
日期:2012.12.1
Abstract Scandium triflateefficiently promotes a one-pot, three-component condensation of aldehydes, malononitrile, and thiophenols to produce highly substituted pyridines in good yields. This reaction does not involve any hazardous organic solvent and toxic catalyst.
Diethylamine Dess–Martin periodinane: an efficient catalyst–oxidant combination in a sequential, one-pot synthesis of difficult to access 2-amino-3,5-dicarbonitrile-6-sulfanylpyridines at ambient temperature
作者:R. V. Kupwade、S. S. Khot、M. A. Kulkarni、U. V. Desai、P. P. Wadgaonkar
DOI:10.1039/c7ra07738f
日期:——
A problem solving approach towards high yielding synthesis of 2-amino-3,5-dicarbonitrile-6-sulfanylpyridines is described. Simple isolation and avoidance of chromatographic purification are the noteworthy advantages.