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: For 2e and 2f, exo-chain addition becomes preferred, and for 2d, endo chain addition much less preferred, than in==================related cases with X = H as mentioned in this paper.
Abstract: Intramolecular Diels–Alder additions of the
2-benzopyran-3-ones 2d, 2e and 2f with an
E-SO2Ph substituent on the
dienophile (X = SO2Ph in 2) show greatly
enhanced exo-addition of the tether than is shown in the
absence of the E-SO2Ph group (X = H in
2). For 2e and 2f, exo-chain addition becomes preferred, and
for 2d, endo-chain addition much less preferred, than in
related cases with X = H. An E-CO2Me
group on the dienophile is also effective in enhancing
exo-chain addition, but less effective than an
E-SO2Ph group. The adducts 4e and 4f undergo
reductive elimination (5% Na–Hg) to give the diterpene related
products 32 and 33 respectively.
4 citations
Journal Article•
TL;DR: Results indicated that compounds 3, 8 and 11 exhibited strong differentiation-stimulating activity on 3T3-L1 cells model, and compound 8 can reduce the blood-sugar level of db diabetes mice dramatically.
Abstract: Thirteen benzopyran derivatives were synthesized and their activity stimulating the differentiation of preadipocytes into adipocytes were evaluated with 3T3-L1 cells. Compound 8 was also tested for its hypoglycemic activity on db diabetes mice model. Results indicated that compounds 3, 8 and 11 exhibited strong differentiation-stimulating activity on 3T3-L1 cells model, and compound 8 can reduce the blood-sugar level of db diabetes mice dramatically.
4 citations
Patent•
17 Jan 1996
TL;DR: In this article, the problem of obtaining an optical recording medium having an organic coloring matter layer containing a benzopyran compound expressed by a specific formula, and capable of forming good fine optical recording portions substantially free from a rim, and small in the jitter of a bit length, was addressed.
Abstract: PROBLEM TO BE SOLVED: To obtain an optical recording medium having an organic coloring matter layer containing a benzopyran compound expressed by a specific formula, and capable of forming good fine optical recording portions substantially free from a rim, and small in the jitter of a bit length. SOLUTION: This optical recording medium for recording or regenerating information with a laser ray having a wavelength of 620-690nm is obtained by disposing an organic coloring matter layer containing a benzopyran compound expressed by formula I [R 1 and R 2 are each a (substituted) alkyl, a cycloalkyl, an aryl, etc.; (X) is H, an alkyl, an alkoxy, a halogen, cyano, etc.; (Y) is an oxygen atom, a sulfur atom, etc.; the ring A is an aromatic carbocyclic group or an aromatic heterocyclic group which may be substituted] on a substrate (e.g. a polycarbonate substrate). The compound is preferably a compound expressed by formula II (R 3 and R 4 are each a 1-12 alkyl; R 5 is an oxygen atom, a nitrogen atom, etc.; R 6 and R 7 are each H, an alkyl, an alkoxy, etc.), e.g. a compound of formula III. COPYRIGHT: (C)1997,JPO
4 citations
TL;DR: The title compound, C 16 H 14 O 5, a furanocoumarin crystallizes in the triclinic space group P1. The structure has been solved by direct methods as mentioned in this paper.
Abstract: The title compound, C 16 H 14 O 5 , a furanocoumarin crystallizes in the triclinic space group P1. The unit cell parameters are a = 7.852(2), b = 8.485(1), c = 11.095(1)A; x = 105.90(1), β = 103.18(2), γ = 95.07(1)°. The structure has been solved by direct methods. Final R = 0.048 for 1943 observed reflections. The furanocoumarin system is almost planar. The epoxide ring makes a dihedral angle with the fused ring system of 98.21(11)°. Molecules are held together by C-H... O hydrogen bonds.
4 citations