A. Mahmud, M. E. Halim, Mk. Ali
Mar 11, 2018
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Journal
Bangladesh Journal of Scientific and Industrial Research
Abstract
Ethyl esters of 2-cyano-3-arylacrylic acid 1a-b ( a = 3- Br- C 6 H 4 , b= 4- OH- C 6 H 4 ) reacted with 5, 5-dimethyl-1, 3-cyclohexane (2b, R = CH3) and 1c-d (c= 3- OH- C6H4, d= 3- NO 2 - C 6 H 4 ) reacted with 1, 3-cyclohexanedione (2a, R = H) and 5, 5-dimethyl-1, 3-cyclohexanedione (2b, R=CH 3 ) in the presence of alcoholic sodium ethoxide to give the corresponding ethyl esters of 2- amino- 7, 7- dimethyl-5-oxo-4-aryl-5, 6, 7, 8-tetrahydro- 4H- chromenes-3-carboxylic acid 3a-c, 3f and 2- amino-5-oxo-4-aryl-5, 6, 7, 8-tetrahydro- 4H- chromenes-3-carboxilic acid ethyl esters 3d-e. The structures of the compounds 3a-f were confirmed by their ultraviolet (UV), infrared (IR), 1H NMR, 13C NMR, mass spectra and elemental analyses. Bangladesh J. Sci. Ind. Res. 53(1) , 35-40, 2018