First Highly Efficient Synthesis of bis(Arylmethylidene)pyranones Mediated by Lithium Perchlorate
作者:M. Saeed Abaee、Mohammad M. Mojtahedi、M. Mehdi Zahedi、S. Mohammad Bolourtchian
DOI:10.1080/00397910500334447
日期:2006.2.1
Abstract A remarkably efficient double‐crossed aldol condensation of tetrahydropyran‐4‐one with a variety of aromatic aldehydes is described at room temperature in the presence of (trimethylsilyl)diethylamine and lithium perchlorate under solvent‐free conditions. Excellent yields of 3,5‐bis(arylmethylidene)pyranones are achieved in a facile one‐pot general procedure.
Three‐component [3 + 3] heterocyclizations have been established undermicrowaveirradiation, providing a flexible synthetic approach toward bicyclicfusedpyridines. 3,5‐Dibenzylidenedihydro‐2H‐pyran‐4(3H)‐ones were subject with malononitrile and aromatic amines in cosolvent of HOAc and N,N‐dimethylformamide, affording 10 examples of pyrano[4,3‐b]pyridine derivatives in good to excellent yields. Similarly
在微波辐射下已经建立了三组分[3 + 3]杂环,为双环稠合吡啶提供了灵活的合成方法。3,5-二苄基二氢-2 H-吡喃-4(3 H)-酮与丙二腈和芳香胺在HOAc和N,N-二甲基甲酰胺的共溶剂中共存,提供了10个吡喃并[4,3- b ]吡啶衍生物实例高产到高产。同样,使用硫拴系杂环作为反应伙伴,获得了七个硫吡喃并[4,3- b ]吡啶衍生物的实例。
γ-Pyrones by Isomerization. Substituted 3,5-Dibenzyl-4H-pyran-4-ones
作者:Nelson J. Leonard、Debabrata Choudhury
DOI:10.1021/ja01558a042
日期:1957.1
Molecular Iodine: An Efficient and Environment Friendly Catalyst for the Synthesis of 3,5-<i>Bis</i>-(arylmethylidene)-tetrahydropyran-4-ones
作者:M. B. Madhusdana Reddy、Aatika Nizam、M. A. Pasha
DOI:10.1080/00397910903531748
日期:2010.11.16
A rapid, efficient, convenient and cost-effective procedure has been developed for the synthesis of 3,5-bis-(arylmethylidene)-tetrahydropyran-4-ones by the condensation of tetrahydropyran-4-one with araldehydes in the presence of catalytic amount of iodine to obtain the products in good to excellent yield. The reactions work at 25 degrees C and go to completion within 30-60min.