Melamine Trisulfonic Acid: An Efficient, Heterogeneous and Reusable Catalyst for the Synthesis of 10-Aryl-6,8-dimethyl- 6, 10-dihydro-5-oxa-6,8-diazaanthra [2,3-d][1,3]dioxole- 7,9-diones
Melamine Trisulfonic Acid (MTSA): A New Efficient Catalyst for the Chemoselective Methoxymethylation of Alcohols
作者:Farhad Shirini、Mohammad Ali Zolfigol、Jalal Albadi
DOI:10.1080/00397910903026707
日期:2010.2.26
Melamine trisulfonic acid, which is easily prepared by the reaction of melamine with neat chlorosulfonic acid, is able to efficiently catalyze the chemoselective methoxymethylation of alcohols with dimethoxymethane (DMM). All reactions were performed under mild and completely heterogeneous reaction conditions in good to high yields.
Melamine trisulfunic acid is employed as a recyclable catalyst for the condensation reaction of aromatic aldehydes with 3‐methyl‐l‐phenyl‐2‐pyrazolin‐5‐one. This condensation reaction was performed in ethanol under refluxing conditions giving 4,4′‐(arylmethylene)‐bis‐(3‐methyl‐1‐phenyl‐1H‐pyrazol‐5‐ols) in 80‐96% yields.
One-pot Three-component Synthesis of Spiro[pyrazolo[3,4-<i>b</i>]pyridine-4,3′-indoline] Derivatives Catalyzed by Melamine Trisulfonic Acid
作者:Li-Min Yang、Peng-Li Sun、Li-Qiang Wu
DOI:10.1002/jccs.201200046
日期:2012.12
Novel spiro[pyrazolo[3,4‐b]pyridine‐4,3′‐indoline] derivatives were prepared by the three‐component reaction of isatins 3‐methyl‐1‐phenyl‐1H‐pyrazol‐5‐amine and Meldrum's acid in the presence of a catalytic amount of melaminetrisulfonicacid. This protocol provides a simple one‐step procedure with the advantages of easy work‐up, mild reaction conditions and environmentally benign.
新型的螺[ pyrazolo [3,4- b ]吡啶-4,3'-二氢吲哚]衍生物是通过靛蓝3-甲基-1-苯基-1 H-吡唑-5-胺与Meldrum酸的三组分反应制备的在催化量的三聚氰胺三磺酸存在下。该协议提供了一个简单的一步程序,具有易于处理,反应条件温和且对环境无害的优点。
Reusable melamine trisulfonic acid-catalyzed three-component synthesis of 7-alkyl-6H,7H-naphtho[1′,2′:5,6]pyrano[3,2-c]chromen-6-ones
作者:Weiwei Ma、Xiao Wang、Fulin Yan、Liqiang Wu、Yingling Wang
DOI:10.1007/s00706-010-0427-9
日期:2011.2
AbstractAn efficient synthesis of 7-alkyl-6H,7H-naphtho[1′,2′:5,6]pyrano[3,2-c]chromen-6-ones by three-component condensation reaction of β-naphthol, aromatic aldehydes, and 4-hydroxycoumarin under solvent-free conditions in good to excellent yields and short reaction times using reusable melamine trisulfonic acid as solid acid catalyst has been investigated. Graphical abstract
摘要通过β-萘酚的三组分缩合反应有效合成7-烷基-6 H,7 H-萘[1',2':5,6]吡喃并[3,2 - c ]铬n-6-使用可重复使用的三聚氰胺三磺酸作为固体酸催化剂,研究了在无溶剂条件下芳族醛和4-羟基香豆素的良好,优异的收率和较短的反应时间。 图形概要
Melamine Sulfonic Acid: A Recoverable Catalyst for the Ecofriendly Synthesis of Thiocyanohydrins Under Solvent-Free Conditions
作者:Ali Reza Kiasat、Mehdi Fallah-Mehrjardi
DOI:10.1080/00397910903100734
日期:2010.4.26
novel and efficient solid acid catalyst has been synthesized and used in the ring opening of epoxidesundersolvent-freeconditions. This catalyst afforded the corresponding thiocyanohydrins with good regioselectivity and very short reaction times. The catalyst can be easily separated and reused several times without appreciable loss of activity. The availability and recoverability of the catalyst with