在这项工作中,将磁化水用作绿色促进介质,用于无催化剂,一锅,实用,高效,环境友好的四氢苯并[ b ]吡喃多组分合成 。一些四氢苯并[ b 通过在室温下醛,丙二腈和1,3-环己二酮或5,5-二甲基-1,3-环己二酮的三组分反应合成对吡喃衍生物。该方法具有反应时间短,成本低,定量收率,后处理简单,不需要有机溶剂的优点。因此它是环境经济的,不会产生危险废物。该系统的分子洞察力表明,磁化水对所有有机试剂之间的相互作用强度具有显着影响,并且按水与每种有机试剂之间氢键数量的顺序增加了1.2倍。在存在磁化水的情况下,试剂在模拟箱的中央更加冷凝,
An efficient one-pot synthesis of functionalized 2-amino-4H-pyrans by a meglumine-catalyzed three-component reaction has been developed. A broad range of substrates including aromatic and heteroaromatic aldehydes, isatin derivatives, and acenaphthenequinone are condensed with enolizable C-H activated compounds and alkylmalonates to give the desired products in high to excellent yields. This methodology provides an alternative approach for rapid access to construct a diversity-oriented library of 4H-pyrans.
10.3184/030823410x12891568367823
作者:Patra, Amarendra、Mahapatra, Tanusri
DOI:10.3184/030823410x12891568367823
日期:——
Cerium(III) Chloride–Catalyzed One-Pot Synthesis of Tetrahydrobenzo[<i>b</i>]pyrans
作者:Gowravaram Sabitha、K. Arundhathi、K. Sudhakar、B. S. Sastry、J. S. Yadav
DOI:10.1080/00397910802378399
日期:2009.1.13
Efficient one-pot synthesis of 4H-benzo[b]pyrans via a three-component cyclocondensation of aryl aldehydes, malononitrile, and dimedone has been reported using CeCl3 center dot 7H(2)O as catalyst.
Lithium Bromide as a Mild, Efficient, and Recyclable Catalyst for the One-Pot Synthesis of Tetrahydro-4<i>H</i>-Chromene Derivatives in Aqueous Media
A simple, efficient, one-pot method has been developed for the synthesis of tetrahydro-4H-chromene derivatives by concurrent reaction of aryl aldehydes, active methylene compounds, and 1,3-cyclohexanedins using a catalytic amount of lithium bromide in aqueous media. The present approach offers several advantages such as shorter reaction times, good yields, low cost, recycling of the catalyst, and simple workup.