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The synthesis and photochromism of a 2,2-diaryl-6-styryl-2H-[1]benzopyran: Unexpected palladium-mediated ring-contraction of a 6-bromo-2,2-diaryl-2H-[1]benzopyran

Dyes and Pigments, 2012
The ligand-free Pd-mediated reaction between styrene and a 6-bromo-2,2-diaryl-2H-[1]benzopyran proceeded anomalously to give a 2-(diarylmethyl)-5-styrylbenzofuran via a tandem Heck coupling – ring-contraction process; none of the styryl substituted 2,2 ...
Christopher D Gabbutt, B Mark Heron, Colin Kilner   +2 more
exaly   +2 more sources

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Organocatalytic Synthesis of Chiral Benzopyrans.

ChemInform, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Thavendran Govender, Leila Hojabri, Firouz Matloubi Moghaddam, Per I. Arvidsson   +3 more
openaire   +1 more source

New benzopyrans: Anticonvulsant activities

Life Sciences, 1975
Three new analogs of dimethylheptylpyran (DMHP) (SP-141, SP-143, and SP-175) were found to exhibit significant anticonvulsant activity against audiogenic, supramaximal electroshock, and maximal pentylentetrazol induced seizures in mice. In rats, all three compounds were found to be more active than diphenylhydantoin in the supramaximal electroshock ...
N P, Plotnikoff, H E, Zaugg, A C, Petersen, D L, Arendsen, R F, Anderson   +4 more
openaire   +2 more sources

Benzopyrans from Hypericum polyanthemum

Phytochemistry, 2001
From the aerial parts of Hypericum polyanthemum Klotzsch ex Reichardt (Guttiferae), three chromenes, 6-isobutyryl-5,7-dimethoxy-2,2-dimethyl-benzopyran; 7-hydroxy-6-isobutyryl-5-methoxy-2,2-dimethyl-benzopyran and 5-hydroxy-6-isobutyryl-7-methoxy-2,2-dimethyl-benzopyran were isolated. Their structures were determined by NMR spectroscopic analyses.
A B, Ferraz, S A, Bordignon, C, Staats, J, Schripsema, G L, Lino von Poser   +4 more
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Sulfamic Acid: An Efficient Catalyst for the Diastereoselective, One-Pot Synthesis of Pyrano Benzopyrans, Furano Benzopyrans and Ethoxy Benzopyrans

Letters in Organic Chemistry, 2005
Sulfamic acid catalyses the one-pot three components coupling of aldehydes, anilines and electron rich dienophiles such as dihydropyran, dihydrofuran and ethyl vinylether resulting in the formation of pyrano, furano and ethoxy benzopyrans.
R. Kumar, R. Nagarajan, K. Vijay, P. Perumal   +3 more
openaire   +1 more source

Benzopyran derivatives from Mallotus apelta

Phytochemistry, 2001
From the leaves of Mallotus apelta, seven benzopyran compounds were obtained and their structures were determined using spectroscopic methods. One showed moderate antibiotic activity against Micrococcus lutens.
T Y, An, L H, Hu, X F, Cheng, Z L, Chen
exaly   +3 more sources

A New Efficient Synthesis of Spirocyclic Benzopyrans

Synthesis, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Gregoire Pave, Pierre Chalard, Marie‐Claude Viaud‐Massuard, Yves Troin, Gerald Guillaumet   +4 more
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A benzopyran derivative substituted at position 3

Acta Crystallographica Section C Crystal Structure Communications, 2002
In (E)-3-[[(diphenoxyphosphoryl)methylhydrazono]methyl]-4H-1-benzopyran-4-one, C(23)H(19)N(2)O(5)P, the benzopyran-methylhydrazone moiety is planar and the two phenoxy phenyl rings are inclined at angles of 21.29 (6) and 89.33 (5) degrees. Weak C[bond]H...O and C[bond]H...N intramolecular interactions exert some influence on the planarity and ...
Agnieszka J, Rybarczyk-Pirek, Magdalena, Małecka, Sławomir J, Grabowski S, Jolanta, Nawrot-Modranka   +3 more
openaire   +2 more sources