Results 171 to 180 of about 3,681 (218)

ChemInform Abstract: Benzopyrans. Part 21. Reaction of 3‐Acyl‐4‐oxo‐4H‐(1)benzopyrans with Diazomethane: Synthesis of Heterocycles Fused with (1)Benzopyran.

ChemInform, 1987
AbstractThe reaction of the benzopyrans (Ia) and (Ib) with excess diazomethane (III) yields the products (II), (IVa), (IVb) and (Va).
C. K. GHOSH, A. BHATTACHARYYA, P. P. GHOSH‐DASTIDAR   +2 more
openaire   +1 more source

Benzopyran sulfonamides as KV1.5 potassium channel blockers

Bioorganic & Medicinal Chemistry Letters, 2007
K(V)1.5 blockers have the potential to be atrium-selective agents for treatment of atrial fibrillation. The benzopyrans provide a template for the synthesis of potent and selective K(V)1.5 blockers.
John, Lloyd, Karnail S, Atwal, Heather J, Finlay, Michael, Nyman, Tram, Huynh, Rao, Bhandaru, Alexander, Kover, Joan, Schmidt, Wayne, Vaccaro, Mary Lee, Conder, Tonya, Jenkins-West, Paul, Levesque   +11 more
openaire   +2 more sources

QSAR studies on benzopyran potassium channel activators

European Journal of Medicinal Chemistry, 2006
QSAR studies on a series of benzopyrans as potassium channel activators have been carried out using a large set of distance-based topological indices. In addition, the molecular descriptors namely: negentropy and molecular redundancy indices have also been used.
V. K. Agrawal, J. Singh, M. Gupta, Y. A. Jaliwala, P. V. Khadikar, SUPURAN, CLAUDIU TRANDAFIR   +5 more
openaire   +3 more sources

Novel photochromism of differently-linked bis-benzopyrans

Organic & Biomolecular Chemistry, 2007
The unique photochromic bis-chromene 5 incorporates the structural attributes of both 3 and 4 . UV-vis irradiation of 5 leads to a dark brown colour, which is formed by mixing the purple and red colours observed for the photolysates of 3 and 4 , respectively.
Jarugu Narasimha, Moorthy, Parthasarathy, Venkatakrishnan, Subhas, Samanta   +2 more
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Multidimensional Photochemistry Model: Application to Aminobenzonitrile and Benzopyran

19th International Conference on Ultrafast Phenomena, 2014
To understand the photoreactivity of aminobenzonitrile and benzopyran, their electronic structures and the potential energy landscapes were analyzed at the CASSCF level and models were developed to perform quantum dynamics ...
Perveaux, Aurélie, Gatti, Fabien, Meyer, Hans-Dieter, Lasorne, Benjamin, Lauvergnat, David, Castro, Pedro J., Reguero, M.   +6 more
openaire   +1 more source

A generalised vibronic-coupling Hamiltonian model for benzopyran

The Journal of Chemical Physics, 2014
A new general model for describing intersecting multidimensional potential energy surfaces when motions of large amplitude are involved is presented. This model can be seen as an extension of the vibronic coupling models of Köppel et al. [“Multimode molecular dynamics beyond the Born-Oppenheimer approximation,” Adv. Chem. Phys. 57, 59 (1984)].
Joubert Doriol, Loic, Lasorne, Benjamin, Lauvergnat, David, Meyer, Hans-Dieter, Gatti, Fabien   +4 more
openaire   +2 more sources

ChemInform Abstract: NEW ROUTES TO BENZOPYRANS. II. 4H‐1‐BENZOPYRANS

Chemischer Informationsdienst, 1979
A. HERCOUET, M. LE CORRE
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Benzopyran derivatives from Melicope pteleifolia

Journal of Asian Natural Products Research
Phytochemical investigation of M. pteleifolia branches and leaves led to the isolation of seven benzopyran derivatives, including five new ones named melicopols A - E (2 - 6). The chemical structures were confirmed by extensive analysis of the 1D, 2D NMR, CD, and HR-QTOF mass spectra. The absolute configuration 1'S of leptol A (1) was firstly confirmed
Pham Thi Cham, Le Thi Vien, Ninh Thi Ngoc, Tran Thi Hong Hanh, Nguyen The Cuong, Nguyen Xuan Cuong, Nguyen Hoai Nam   +6 more
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A Simple Synthesis of Benzopyrans

HETEROCYCLES, 1975
Tetsuji Kametani, Kazuo Kigasawa, Mineharu Hiiragi, Haruhide Ishimaru, Nagatoshi Wagatsuma   +4 more
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Benzopyrans

1977
Nicholas P. Plotnikoff, Harold E. Zaugg
openaire   +1 more source