Greener construction of 4H-chromenes based dyes in deep eutectic solvent
作者:Najmedin Azizi、Mahboobe Mariami、Mahtab Edrisi
DOI:10.1016/j.dyepig.2013.09.007
日期:2014.1
environmentally-benign one-potreaction of salicylaldehyde and malononitrile with various nucleophiles, including indoles, thiols, secondary amines, cyanide and azide were efficiently achieved in choline chloride based deep eutectic solvent (DES). Products distribution of the current green protocol depend on the nature of the nucleophile used in the reaction. The one-potreaction of salicylaldehyde derivatives
An environmentally benign, ionicliquid promoted multicomponent protocol to benzopyrano(2,3-d)pyrimidines and 4H-chromenes has been developed at roomtemperature. Results of the reaction depend on the nature of the nucleophile used in the reaction. Secondary amines result in the formation of benzopyrano(2,3-d)pyrimidines, whereas thiols give rise to 4H-chromenes under the same set of reaction conditions
Sodium Formate-Catalyzed One-Pot Synthesis of Benzopyranopyrimidines and 4-Thio-substituted 4<i>H</i>-Chromenes via Multicomponent Reaction at Room Temperature
作者:Goutam Brahmachari、Suvankar Das
DOI:10.1002/jhet.2123
日期:2015.5
A simple, straightforward and highly efficientmulticomponentone‐potsynthesis of a series of pharmaceutically interesting benzopyranopyrimidine and 4H‐chromene derivatives has been developed on the basis of low‐cost and environment‐friendly sodium formate catalyst via tandem reactions of salicylic aldehydes, malononitrile, and cyclic secondary amines in ethanol at room temperature. Nature of nucleophile
通过水杨醛,丙二腈的串联反应,在低成本,环境友好的甲酸钠催化剂的基础上,开发了一种简单,直接,高效的多组分一锅法合成一系列有趣的苯并吡喃并嘧啶和4 H-色烯衍生物。以及室温下在乙醇中的环状仲胺。该反应中所用亲核试剂的性质决定了反应的过程。环状仲胺导致苯并吡喃并[2,3- d ]嘧啶的形成,而苯硫酚则提供相应的4-硫取代的4 H色烯在相同的反应条件下。高原子经济性,高收率,生态友好和温和的反应条件是该方案的重要特征。
One-Step Synthesis of Heterocyclic Privileged Medicinal Scaffolds by a Multicomponent Reaction of Malononitrile with Aldehydes and Thiols
作者:Nikolai M. Evdokimov、Artem S. Kireev、Andrey A. Yakovenko、Mikhail Yu. Antipin、Igor V. Magedov、Alexander Kornienko
DOI:10.1021/jo070114u
日期:2007.4.1
Heterocyclic privileged medicinal scaffolds involving pyridine, 1,4-dihydropyridine, chromeno[2,3-b]pyridine, and dihydro-1,4-dithiepine frameworks are prepared via a single-step multicomponent reaction of structurally diverse aldehydes with various thiols and malononitrile. Mechanistic studies of the synthetic pathway leading to pyridines reveal that 1,4-dihydropyridines undergo oxidation by the intermediate Knoevenagel adducts rather than by air oxygen. The use of o,o'-disubstituted aromatic aldehydes leads to the corresponding 1,4-dihydropyridines, whereas salicylic aldehydes result in chromeno[2,3-b]pyridines. Reactions of ethanedithiol as a thiol component produce dimeric pyridines with sterically unencumbered aldehydes, while o,o'-disubstituted aromatic aldehydes give dihydro-1,4-dithiepines. Thus, depending on the aldehyde and thiol types, diverse libraries of medicinally relevant compounds can be prepared by a simple one-step process involving no chromatography.