Topic
Benzopyrans
About: Benzopyrans is a research topic. Over the lifetime, 694 publications have been published within this topic receiving 8830 citations.
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28 May 1997
TL;DR: Pyrido-fused 4-oxo-4H-benzopyrans I I (m=0, 1 or 2; R1, R6 and R7 have the meanings stated in the description) and the salts of I as discussed by the authors.
Abstract: Pyrido-fused 4-oxo-4H-benzopyrans I I (m=0, 1 or 2; R1, R6 and R7 have the meanings stated in the description) and the salts of I, and herbicides which contain 2-(4-hetaryloxy)- and 2-(4-aryloxy)-phenoxyacetic acid derivatives or cyclohexenone derivatives as herbicidal active ingredients and pyrido-fused 4-oxo-4H-benzopyrans I' as antidotes.
1 citations
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29 Nov 1991TL;DR: In this article, the authors defined 2-amino-4-oxo-4H-benzopyrans (I) as herbicidally active substances.
Abstract: Disclosed are 2-amino-4-oxo-4H-benzopyrans (I) (in which m = 0, 1 or 2; and R1 to R4 are as defined in the description), as well as salts of compound (I), and herbicides containing the 2-(4-heteroaryloxy)- and 2-(4-aryloxy) phenoxyacetic acid derivatives and/or cyclohexenone derivatives as herbicidally active substances, and 2-amino-4-oxo-4H-benzopyrans (I') as antidotes.
1 citations
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TL;DR: In this paper, a trityl ion-mediated C-H functionalization of benzopyrans and related heterocycles with potassium trifluoroborates and various CH nucleophiles is presented.
Abstract: A trityl ion-mediated C-H functionalization of benzopyrans and related heterocycles with potassium trifluoroborates and various C-H nucleophiles is presented.
1 citations
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TL;DR: In this article, the catalytic addition of the amino acid derived bifunctional N-acylaminophosphine to an α-substituted allene ester generated a zwitterionic dipole that engaged the vinylogous ester function of 3-cyano-chromones in a [4 + 2] annulation reaction to deliver tetrahydroxanthones embodying three consecutive chiral centers.
Abstract: The catalytic addition of the amino acid derived bifunctional N-acylaminophosphine to an α-substituted allene ester generated a zwitterionic dipole that engaged the vinylogous ester function of 3-cyano-chromones in a [4 + 2] annulation reaction to deliver tetrahydroxanthones embodying three consecutive chiral centers in high yields and with excellent enantioselectivities. The established asymmetric synthesis further paves the way to two different classes of complex, sp3-rich tetracyclic benzopyrans via efficient cascade reactions.
1 citations