Synthesis and molecular structure of spirocyclic 2-oxindole derivatives of 2-amino-4H-pyran condensed with the pyrazolic nucleus
摘要:
4,3'-Spiro[(6-amino-5-R-3-methyl-2H,4H-pyrano[2,3-c]pyrazolo)-2'-oxindoles] were synthesized based on the three-component condensation of isatins with 3-methyl-pyrazolone-5 and respective methylene active nitriles in the presence of basic catalysts. The molecular structure of the resulting compounds was proved unambiguously by X-ray diffraction. (C) 2007 Elsevier Ltd. All rights reserved.
catalyst for the synthesis of a series of pyranopyrazole derivatives via a one-pot, four-component reaction of carbonyl compound or isatin, hydrazine hydrate, malononitrile, and β-keto ester in EtOH–H2O. The catalyst was found to work extremely for aldehydes, ketones or isatins at room temperature to give the corresponding dihydropyrano[2,3-c]pyrazole or spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives
证明葡甲胺是一种生物基化学物质,它是通过羰基化合物或靛红,水合肼,丙二腈和β的单锅四组分反应合成一系列吡喃并吡唑衍生物的高效且可重复使用的催化剂。酮的EtOH-H酯2 O.将催化剂在室温下发现极其对醛,酮或靛红工作以得到相应的二氢吡喃并[2,3- c ^ ]吡唑或螺[二氢吲哚-3,4'-吡喃并并[2,3- c ^ ]吡唑]衍生物以高产率。这个新方法的显着特点是广泛的底物范围,室温下的反应条件,反应时间短,产量高,容易进行后处理过程中,催化剂的可重用性,并且不存在有害的有机溶剂。
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...
Green Access to Multi-Component Synthesis of Spiropyranopyrazoles
作者:D. Pore、P. Hegade、D. Gaikwad、P. Patil、J. Patil
DOI:10.2174/15701786113106660069
日期:2014.1.31
A catalyst-free multi-component synthesis of spiro[indoline-3,4’-pyrano[2,3-c]pyrazoles] is reported from in
situ formed pyrazolone by exothermic reaction of ethyl acetoacetate with hydrazine hydrate, isatin and malononitrile in
water at room temperature. A suggested mechanistic approach was supported by semi-empirical calculations. The
transformation is carried out in water alone and thus achieved the highest level of green chemistry. Simple reaction
conditions, easy work-up procedure and isolation of products are the auxiliary advantages of present protocol.
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.
Novel and Efficient One-Pot Synthesis of Spiro[Indoline-3,4′-Pyrano [2,3-c]pyrazole]Derivatives Catalysed by L-Proline in Aqueous Medium
作者:Jiangxia Yu、Yongbing Zhou、Tianhua Shen、Wengang Mao、Kang Chen、Qingbao Song
DOI:10.3184/174751913x13687116634925
日期:2013.6
An efficient mild one-pot synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole derivatives by a four-component reaction of hydrazine, a β-keto ester, isatin, and malononitrile catalysed by L-proline in water is reported.