One-pot cascade synthesis of benzopyrans and dihydropyrano[c]chromenes catalyzed by lipase TLIM
作者:Yajie Fu、Zeping Lu、Xiaolong Ma、Ke Fang、Xinyi He、Huajin Xu、Yi Hu
DOI:10.1016/j.bioorg.2020.103888
日期:2020.6
Lipase TLIM was reported to be an efficient, commercially available and reusable catalyst for the Knoevenagel-Michael cascade reactions of aldehydes, malononitrile/ethyl cyanoacetate and 4-hydroxycoumarin/1, 3-cyclohexanedione/dimedone in aqueous DMSO. This methodology presents many superiorities such as simple procedure, mild reaction conditions, commercially available and reusable catalyst, high
Synthesis and characterization of guanine-functionalized mesoporous silica [SBA-16-G]: a metal-free and recyclable heterogeneous solid base catalyst for synthesis of pyran-annulated heterocyclic compounds
作者:Radha Gupta、Samaresh Layek、Devendra Deo Pathak
DOI:10.1007/s11164-018-3693-5
日期:2019.3
respectively, based on BET and CO2-TPD analysis. The catalyticactivity of the synthesized catalyst has been explored in the synthesis of a series of biologically and pharmaceutically active pyran-annulated heterocyclic compounds from a one-pot three-component reaction of an aromatic aldehyde, malononitrile/ethyl cyanoacetate, and a C–H activated acidic compound, in the presence of a catalytic amount (10 wt%)
摘要 描述了一种新型的固体碱催化剂的合成,即鸟嘌呤官能化的介孔二氧化硅[SBA-16-G]。通过FTIR,固态13 C NMR,TGA,XRD,BET,FESEM,EDAX,CHNS元素分析,CO 2 -TPD和TEM技术对合成的催化剂进行了充分表征。基于BET和CO 2,发现合成的[SBA-16-G]的表面积和碱度分别为524 m 2 / g和3.230 mmol / g。-TPD分析。从芳香醛,丙二腈/氰基乙酸乙酯和CH的单锅三组分反应中合成一系列具有生物学和药学活性的吡喃环化杂环化合物中,已经探索了合成催化剂的催化活性。催化量(10重量%)的[SBA-16-G]存在下的酸性化合物。该催化剂不含金属,易于合成并从反应混合物中分离出来,可循环使用四次而不会明显降低催化活性。 图形概要
Kadam, Kailash R.; Murade, Vaishali D.; Pandit, Shivaji S., Indian Journal of Heterocyclic Chemistry, 2022, vol. 32, # 1, p. 51 - 59
作者:Kadam, Kailash R.、Murade, Vaishali D.、Pandit, Shivaji S.、Waghmare, Amit S.
DOI:——
日期:——
Organic Reactions in Water: An Efficient Synthesis of Pyranocoumarin Derivatives
A mild and efficient protocol for the synthesis of pyrano[3,2-c]coumarins from 4-hydroxycoumarin through a one-pot reaction in water under phase-transfer conditions has been developed.