Topic
Benzopyran
About: Benzopyran is a research topic. Over the lifetime, 1889 publications have been published within this topic receiving 15235 citations.
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TL;DR: Weinreb-α-aminoamides were prepared from 4-chlorocoumarin and α-amINOacid derivatives, and their reaction with organometallic compounds (RLi or RMgBr) and subsequent cyclization of ketones thus obtained, give [1]benzopyrano[4,3-b]pyrrol-4(1H)-ones as mentioned in this paper.
Abstract: N(α)-(2-Oxo-2H-1-benzopyran-4-yl)Weinreb-α-aminoamides were prepared from 4-chlorocoumarin and α-aminoacid derivatives. Their reaction with organometallic compounds (RLi or RMgBr) and subsequent cyclization of ketones thus obtained, give [1]benzopyrano[4,3-b]pyrrol-4(1H)-ones. Starting from proline derivatives, simultaneously with the pyranone-pyrrole fusion, we establish an interesting procedure for the formation of pyrrolizines.
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TL;DR: In this article , a series of pyridinium-based ionic liquids (PBILs) were synthesized through a simple method, which was initially evaluated as catalysts for the synthesis of tetrahydro[b]benzopyran derivatives via a one-pot three-component reaction involving aldehydes, malononitrile, and dimedone.
Abstract:
In this work, a series of pyridinium-based ionic liquids (PBILs) were synthesized.
Pyridinium-based ionic liquids (PBILs) were synthesized through a simple method, which was initially evaluated as catalysts for the synthesis of tetrahydro[b]benzopyran derivatives via a one-pot three-component reaction involving aldehydes, malononitrile, and dimedone.
The PBILs perform well in this condensation reaction, especially 1-methylpyridin-1-ium dimethyl phosphate (MPDMP).
The advantages of this procedure are good yields, short reaction time, simplicity of implementation, and inexpensive starting materials.
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TL;DR: In this paper, a simple and improved procedure for preparing multi-gram quantities of 2,2'-spirobi[2H-1-benzopyran] (2) was reported.
Abstract: A simple and improved procedure for preparing multi-gram quantities of 2,2'-spirobi[2H-1-benzopyran] (2) is reported. The cyclization of the dihydroxybenzopyran intermediate (1) into 2 proceeded smoothly when a solution of 1 in 2-ethoxyethyl acetate was heated under reflux for 3 hours
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