SnO nanoparticles have been used as an efficientcatalyst for the preparation of chromeno[2,3-b]pyridines and 2-amino-3,5-dicyano-6-sulfanyl pyridines under reflux conditions in ethanol in good to excellent yields. This flexible and nano-catalytic procedure showed good recyclability and provides a clean condensation reaction in a short reaction time.
SnO纳米颗粒已被用作高效的催化剂,用于在乙醇中回流条件下以良好至极好的收率制备苯并[2,3- b ]吡啶和2-氨基-3,5-二氰基-6-硫烷基吡啶。这种灵活的纳米催化程序显示出良好的可回收性,并在较短的反应时间内提供了干净的缩合反应。
Highly efficient synthesis of benzopyranopyridines via ZrP<sub>2</sub>O<sub>7</sub>nanoparticles catalyzed multicomponent reactions of salicylaldehydes with malononitrile and thiols
ZrP2O7 nanoparticles as an efficient catalyst have been used for the preparation of benzopyrano[2,3-b]pyridines from the four-component condensation reaction of salicylalde-hydes, thiols, and 2 equiv. of malononitrile under reflux conditions in ethanol in excellent yields and short reaction times.[GRAPHICS].
Chitosan functionalized by citric acid: an efficient catalyst for one-pot synthesis of 2,4-diamino-5<i>H</i>-[1]benzopyrano[2,3-<i>b</i>]pyridine-3-carbonitriles 5-(arylthio) or 5-[(arylmethyl)thio] substituted
ABSTRACT Chitosan (CS) functionalized by citric acid has been used as an efficient catalyst for the preparation of 2,4-diamino-5H-[1]benzopyrano[2,3-b]pyridine-3-carbonitriles 5-(arylthio) or 5-[(arylmethyl)thio] substituted by a multicomponent reaction of salicylaldehydes, thiols and 2 equiv. of malononitrile under reflux condition in ethanol. Use of simple and readily available starting materials