First report of the application of simple molecular complexes as organo-catalysts for Knoevenagel condensation
作者:Sumit Kumar Panja、Nidhi Dwivedi、Satyen Saha
DOI:10.1039/c5ra09036a
日期:——
Knoevenagel condensation is used to synthesize a series of important cyano group containing synthetic precursors for synthesis of biologically active molecules at RT using a minimum amount of catalyst (∼5 mol%) without the need for chromatographic separation techniques. Detailed mechanistic studies and substituenteffects of aromaticaldehydes on the reaction have been investigated. In addition, biologically
Electrocatalytic chain transformation of salicylaldehyde and CH acids into substituted 4H-chromenes
作者:S. K. Feducovich、M. N. Elinson、A. S. Dorofeev、S. V. Gorbunov、R. F. Nasybullin、N. O. Stepanov、G. I. Nikishin
DOI:10.1007/s11172-008-0093-9
日期:2008.3
Electrochemically initiated catalytic chain transformation of salicylaldehydes and CH acids containing the cyano group in an ethanolicsolution in an undivided cell produced substituted 4H-chromenes in 85–95% yields.
Aegle marmelos in heterocyclization: greener, highly efficient, one-pot three-component protocol for the synthesis of highly functionalized 4H-benzochromenes and 4H-chromenes
作者:Sachin Shinde、Shashikant Damate、Smita Morbale、Megha Patil、Suresh S. Patil
DOI:10.1039/c6ra28779d
日期:——
A facile, one-potthree-component protocol for the synthesis of 2-amino-4H-chromene derivatives has been demonstrated using Bael Fruit Extract (BFE) as a natural catalyst in a green reaction medium. This method offers a mild, efficient and highly economical protocol since the reaction proceeds in natural BFE-catalyst at room temperature under aerobic conditions with a very short reaction time (30 min)
Diethylamine: A smart organocatalyst in eco-safe and diastereoselective synthesis of medicinally privileged 2-amino-4H-chromenes at ambient temperature
作者:Makarand A. Kulkarni、Kapil S. Pandit、Uday V. Desai、Uday P. Lad、Prakash P. Wadgaonkar
DOI:10.1016/j.crci.2013.02.016
日期:2013.8
Résumé Diethylamine has been demonstrated to be an efficient organocatalyst in the diastereoselective synthesis of Bcl-2 protein antagonist (HA-14-1) and of its structural analogues by one-pot condensation between salicylaldehyde and three different C–H acids, viz. ethyl cyanoacetate, phenylsulfonyl acetonitrile, and malononitrile. Easy commercial availability of the catalyst at extremely low cost and avoidance of conventional work-up as well as purification procedures qualifies this scalable protocol for a “near-ideal synthesis”. Supplementary Materials: Supplementary material for this article is supplied as a separate file: mmc1.docx
An efficient condensation of substituted salicylaldehyde and malononitrile catalyzed by lipase under microwave irradiation
作者:Fengjuan Yang、Zhi Wang、Haoran Wang、Chunyu Wang、Lei Wang
DOI:10.1039/c5ra10565j
日期:——
The present work illustrates the condensation of substituted salicylaldehyde and malononitrile catalyzed by lipase under microwave irradiation. The reaction obtains two different products by a delicate control of the substrate molar ratio and reaction time. This protocol has the advantages of high yield, short reaction time and environmental friendliness.