首次将α-酪蛋白用作有效,简便地制备二氢吡喃并吡咯和螺吡喃并吡咯的有效和环保催化剂。通过一锅,拟五组分缩合反应开发了双(吡唑-5-醇)衍生物,并通过一锅四组分反应制备了目标二氢吡喃并[2,3- c ]吡唑和螺吡喃并吡唑。这种使用α-酪蛋白的新方法是一种绿色,可回收,无毒且可商购的催化剂,具有以下优点:条件温和,反应时间短,易于后处理,无需柱色谱法且收率高。使其比其他环境合成协议更经济的产品。
3-Hydroxy-3-((3-methyl-4-nitroisoxazol-5-yl)methyl)indolin-2-one as a versatile intermediate for retro-Henry and Friedel–Crafts alkylation reactions in aqueous medium
retro-Henry type reaction is reported using 3-hydroxy-3-((3-methyl-4-nitroisoxazol-5-yl)methyl)indolin-2-ones which are prepared via catalyst-free Henry reaction of 3,5-dimethyl-4-nitroisoxazole and isatin. These compounds were used for the selective synthesis of 3-hydroxy-indolyl-2-oxindoles and bis-indolyl-2-oxindoles (symmetric/unsymmetric) via retro-Henry type reaction followed by Friedel–Crafts alkylation
Alpha-Casein: an efficient, green, novel, and eco-friendly catalyst for one-pot multi-component synthesis of bis (pyrazol-5-ols), dihydro-pyrano[2,3-c]pyrazoles and spiropyranopyrazoles in an environmentally benign manner
time, alpha-Casein was used as an efficient and eco-friendly catalyst for an effective and facile preparation of dihydropyranopyrazoles and spiropyranopyrazoles. The synthesis of bis (pyrazol-5-ols) derivatives was developed via one-pot, pseudo-five-component condensation, and the target dihydropyrano[2,3-c]pyrazoles and spiropyranopyrazoles were prepared by one-pot four-component reaction. This new
首次将α-酪蛋白用作有效,简便地制备二氢吡喃并吡咯和螺吡喃并吡咯的有效和环保催化剂。通过一锅,拟五组分缩合反应开发了双(吡唑-5-醇)衍生物,并通过一锅四组分反应制备了目标二氢吡喃并[2,3- c ]吡唑和螺吡喃并吡唑。这种使用α-酪蛋白的新方法是一种绿色,可回收,无毒且可商购的催化剂,具有以下优点:条件温和,反应时间短,易于后处理,无需柱色谱法且收率高。使其比其他环境合成协议更经济的产品。
“On water” highly atom economical and rapid synthesis of a novel class of 3-hydroxy-2-oxindole scaffolds under a catalyst-free and column chromatography-free protocol at room temperature
作者:Pramod B. Thakur、Harshadas M. Meshram
DOI:10.1039/c3ra46613b
日期:——
An âon waterâ highly atom economical and rapid protocol has been developed for the synthesis of a novel class of 3-(2-pyrazolin-5-one) substituted, 3-hydroxy-2-oxindole scaffolds under catalyst-free and column chromatography-free conditions at rt. The generality of the method has been demonstrated by screening a series of isatin electrophiles as well as 2-pyrazolin-5-one derivatives. The developed method is a good example of green synthesis in which straightforward synthesis of a medicinally important 3-hydroxy-2-oxindole framework is executed by employing very mild, simple and handy procedures from readily available starting materials.
Unprecedented, <scp>catalyst‐free,</scp> and rapid <scp>one‐pot</scp>, <scp>three‐component</scp> green synthesis of substituted 3‐hydroxy‐2‐oxindoles in water
作者:Mayur G. Patil、Ganesh A. Thakur、Rupashri K. Kadu、Pramod B. Thakur
DOI:10.1002/jhet.4737
日期:2023.12
An efficient, unprecedented, catalyst-free, and rapid synthesis of substituted 3-hydroxy-2-oxindoles is described by the one-pot, three-component reaction of hydrazine hydrate, ethyl acetoacetate, and isatins in water. The reported protocol is a green and general route for the simple preparation of new heteroaromatic substituted 3-hydroxy-2-oxindoles in quantitative yields under very mild reaction