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: In this paper, the presence of six compounds, i.e., the epimeric hydroxyfuro[2,3-b]benzofurans 4, a pair of diastereomers of the hydroxylated tetrahydrofuran 6 and the diastereric pair of benzopyran aldehydes 8, was identified in the equilibrium mixture established when hemiacetals 4 were in solution.
8 citations
TL;DR: An efficient synthesis of 3-methyl-4- ((4-oxo-4H-chromen-3-yl) methylene)-1-pheny-1H- pyrazol-5-(4H)-ones 3a-m in solid-state by grinding without solvent at room temperature is described in this paper.
Abstract: An efficient synthesis of 3-methyl-4- ((4-oxo-4H-chromen-3-yl) methylene)-1-pheny-1H- pyrazol-5-(4H)-ones 3a-m in solid-state by grinding without solvent at room temperature. Keyword: Grinding, solid-state, 3-formyl chromone, pyrazolinone, Knoevenagel reaction
8 citations
TL;DR: The (S)-(−)-chroman-2-acetic acid 5 and its derivatives are plvotal intermediates in various total syntheses of natural a-tocopherol (1) developed in our laboratories as mentioned in this paper.
Abstract: The (S)-(−)-chroman-2-acetic acid 5 and its derivatives are plvotal intermediates in various total syntheses of natural (2R,4′FJ,E′FJ)- a- tocopherol (1) developed in our laboratories. 1–5 Certain of these convergent schemes,1–3 involving coupling of C15-chroman and C14-side chain units possessing very high enantiomeric and diastereomeric purities, have also proven useful for construction of all 7 stereoisomers of natural a-tocopherol.6
8 citations
TL;DR: The 4-oxospiro[benzopyran-2,4′ piperidine] ring system is contained within potent class III antiarrhythmic agents.
8 citations
TL;DR: In this paper, a preferred "in plane" conformation of 4 S (4-fluorobenzoylamino)benzopyran SB-204269 was found to be essential for optimal potency at a unique receptor site.
8 citations