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: The pyridinium methylid (5), generated from 1-(4-oxo-4H-1-benzopyran-2-yl)methylpyrinium iodide (4) in the presence of a base, undergoes cycloaddition with dimethyl acetylenedicarboxylate and ethyl propiolate, thecycloadducts rapidly aromatising to the indolizines (8) and (9) respectively as discussed by the authors.
Abstract: The pyridinium methylid (5), generated from 1-(4-oxo-4H-1-benzopyran-2-yl)methylpyridinium iodide (4) in the presence of a base, undergoes [3+2] cycloaddition with dimethyl acetylenedicarboxylate and ethyl propiolate, thecycloadducts rapidly aromatising to the indolizines (8) and (9), respectively. Similar cycloaddition of 5 with ethyl acrylate and acrylonitrile is also followed by dehydrogenation giving respectively the indolizines (9) and (10).
5 citations
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19 May 2009TL;DR: In this article, processes for the preparation of isoflavonoids, in particular haginin E, equol, daidzein, formononetin and the like, in which 7-benzyloxy-3-(4-methoxyphenyl)-2H-1 -benzopyran is used as a common starting material.
Abstract: Disclosed herein are processes for the preparation of isoflavonoids, in particular haginin E, equol, daidzein, formononetin and the like, in which 7-benzyloxy-3-(4-methoxyphenyl)-2H-1-benzopyran is used as a common starting material.
5 citations
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TL;DR: The crystal structure determination of C 23 H 22 N 2 O 7 showed that the mutual dispositions of the H atoms attached to the four successive chiral centres are gauche, gauche and trans as discussed by the authors.
Abstract: The crystal structure determination of C 23 H 22 N 2 O 7 shows that the mutual dispositions of the H atoms attached to the four successive chiral centres are gauche, gauche and trans.
5 citations
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5 citations
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20 Feb 1996
TL;DR: In this paper, certain benzopyran antiestrogens are disclosed for treating estrogen sensitive diseases such as breast cancer, and they provide ease of manufacturing, good shelf life, and bio-availibility.
Abstract: Certain benzopyran antiestrogens are disclosed for treating estrogen sensitive diseases such as breast cancer. Prodrug forms provide ease of manufacturing, good shelf life, and bioavailibility.
5 citations