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The title compound ethyl 2-(2-amino-3-ethoxycarbonyl-4H-benzopyran-4-yl) cyanoacetate(C17H18N2O5, Mr=330.33) was obtained by the reaction of salicylaldehyde with ethyl cyanoacetate in DMF at room temperature catalyzed by KF-Al2O3. The crystal is monoclinic, space group P21/n, with unit cell constants a =9.277(3), b =8.521(2), c =21.320(2)? b =93.72(2)? Z =4, V =1681.8(7)?, Dc =1.305g/cm3, m (MoKa) =0.097mm-1, F(000) =696, R =0.0426, Rw =0.0970 for 3042 observed reflections(I>2s(I)). X-ray analysis reveals that interatomic distance for C(8)C(9) is 1.359(3)? which shows that it is C=C double bond. In addition, there are hydrogen bonds in the molecule.
The title compound ethyl 2- (2-amino-3-ethoxycarbonyl-4H-benzopyran-4-yl) cyanoacetate was obtained from the reaction of salicylaldehyde with ethyl cyanoacetate in DMF at room temperature catalyzed by KF- Al2O3. The crystal is monoclinic space group P21 / n with unit cell constants a = 9.277 (3), b = 8.521 (2) and c = 21.320 (2)? B = 93.72 = 1681.8 (7) ?, Dc = 1.305g / cm3, m (MoKa) = 0.097mm-1, F000 = 696, R = 0.0426, Rw = 0.0970 for 3042 observed reflections (I> 2s (I) . X-ray analysis reveals that interatomic distance for C (8) C (9) is 1.359 (3)? Which shows that it is C = C double bond.