<scp>Ag<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub></scp>nanoparticles: An<scp>eco‐friendly</scp>and reusable catalyst for synthesis of pyrano[<i>c</i>]chromenediones and [1,3]dioxolo[<i>g</i>]chromeneones in aqueous media at ambient temperature
作者:Mitra Ebrahimi、Shahrzad Abdolmohammadi、Reza Kia‐Kojoori
DOI:10.1002/jccs.201900488
日期:2020.10
green protocol for the synthesis of 4‐aryl‐3,4‐dihydro‐2H,5H‐pyrano[3,2‐c]chromene‐2,5‐diones and 8‐aryl‐7,8‐dihydro‐6H‐[1,3]dioxolo[4,5‐g]chromene‐6‐ones through the Ag2Cr2O7 nanoparticles catalyzed cyclocondensation reaction of active methylene compounds including 4‐hydroxycoumarin or 3,4‐methylenedioxyphenol, aromatic aldehydes, and meldrum's acid in water at ambient temperature was described. This
一种高效且绿色的合成4-芳基-3,4-二氢-2 H,5 H-吡喃并[3,2 - c ]色烯-2,5-二酮和8-芳基-7,8-二氢的方案通过Ag 2 Cr 2 O 7生成-6 H ‐ [1,3] dioxolo [4,5‐ g ]色烯-6‐one描述了在环境温度下,纳米粒子在水中催化活性亚甲基化合物(包括4-羟基香豆素或3,4-亚甲基二氧基苯酚,芳族醛和me的酸)的环缩合反应。与目前采用的方法相比,该方法具有许多优势,例如反应条件温和,后处理简单,收率好至极好,避免了有毒的催化剂和有害溶剂以及催化剂的回收和再利用。