Green synthesis of tetrahydrobenzo[b]pyrans, pyrano[2,3-c]pyrazoles and spiro[indoline-3,4′-pyrano[2,3-c]pyrazoles catalyzed by nano-structured diphosphate in water
作者:Behrooz Maleki、Negar Nasiri、Reza Tayebee、Amir Khojastehnezhad、Hossien Ali Akhlaghi
DOI:10.1039/c6ra15800e
日期:——
A green and recoverable nano-structured diphosphate (Na2CaP2O7) was synthesized and fully characterized using FT-IR spectra, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) analysis. The...
Chitosan, a reusable heterogeneous catalyst, can be combined with an ionic liquid as a green solvent to generate a highly efficient catalyst system for our densely functionalised and diversified target molecule. The reaction is completed with a good to excellent yield. This procedure demonstrates an eco-friendly catalyst system and eliminates the use of toxic transition metal catalysts, bases and volatile organic solvents, which adversely affect the environment and human beings.
Rapid and Efficient Ultrasound-Assisted Method for the Combinatorial Synthesis of Spiro[indoline-3,4′-pyrano[2,3-<i>c</i>]pyrazole] Derivatives
作者:Yi Zou、Yu Hu、Hai Liu、Daqing Shi
DOI:10.1021/co200128k
日期:2012.1.9
An efficient one-pot synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives by four-component reaction of hydrazine, β-keto ester, isatin, and malononitrile or ethyl cyanoacetate catalyzed by piperidine under ultrasound irradiation is described. This synthesis was confirmed to follow the group-assistant-purification chemistry (GAP) chemistry process, which can avoid traditional chromatography
哌啶催化肼,β-酮酸酯,靛红和丙二腈或氰基乙酸乙酯的四组分反应,有效地一锅合成螺[吲哚啉-3,4'-吡喃并[2,3- c ]吡唑]衍生物描述在超声波照射下。确认该合成遵循组辅助纯化化学(GAP)化学过程,可以避免传统的色谱纯化和重结晶纯化。