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DOI: 10.1055/s-0030-1258171
A Facile and Practical Solvent-Free One-Pot Synthesis of (Z)-4-Methylene-3-selenaquinoline Derivatives from o-Ethynylanilines and Isoselenocyanates [¹]
Publication History
Publication Date:
12 July 2010 (online)
Abstract
Heating of o-ethynylanilines with isoselenocyanates directly resulted in the 6-exo-dig mode ring-closure reaction of the adducts to give the (Z)-2-imino-4-methylene-3-selenaquinolines in moderate to good yields. Based on this convenient, solvent-free, catalyst-free method, several 3-selenaquinoline derivatives (3,1-benzoselenazines) were easily obtained in one pot. Successful application of the microwave-assisted synthesis of these compounds was also investigated.
Key words
o-ethynyaniline - isoselenocyanate - 3-selenaquinoline - 6-exo mode cyclization - microwave
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References
Single crystals of 3Dd were obtained from solns of CHCl3 after slow evaporation of the solvent at r.t. Diffraction data were collected on a Bruker Apex-II CCD. The structure analysis is based on 2629 observed reflections with I > 2.00σ(I) and 217 variable parameters; colorless prisms, C21H16N2Se, FW = 375.32, 233 K, monoclinic, space group P21/n, a = 10.3882(7) Å, b = 8.3928(5) Å, c = 19.432(1) Å, β = 91.164(1)˚, V = 1693.9(2) ų, Z = 4, R = 0.0288, R w = 0.0759, GOF = 1.037. The supplementary crystallographic data for 3Dd (CCDC-773220) can be obtained free of charge from the Cambridge Crystallographic Data Centre via http://www.ccdc.cam.ac.uk/products/csd/request/request.php4.