“…In each occasion, the spectral data ( 1 H and 13 C NMR) of known compounds were compared with that reported in the literature. 6,7,-phenyl-4H-chromene-3-carbonitrile (1a) (Yu and Da-Ming, 2012;Xu et al, 2011), 2-amino-5,6,7,8-tetrahydro-4-(4-fluorophenyl)-5-oxo-4H-chromene-3-carbonitrile (1b) (Yu and Da-Ming, 2012), 2-amino-5,6,7,8-tetrahydro-4-(4-bromophenyl)-5-oxo-4H-chromene-3-carbonitrile (1c) (Yu and Da-Ming, 2012), 2-amino-5,6,7,8- (Xu et al, 2011), 2-amino-5,6,7,8-tetrahydro-4-(4-methoxyphenyl)-5-oxo-4H-chromene-3-carbonitrile (1i) (Xu et al, 2011;Rostamnia and Morsali, 2014), 2-amino-5,6,7,8-tetrahydro-4-(4-nitrophenyl)-5-oxo-4H-chromene-3-carbonitrile (1j) (Yu and Da-Ming, 2012;Xu et al, 2011;Rostamnia and Morsali, 2014;HosseiniMonfared et al, 2013), 2-amino-5,6,7,8-tetrahydro-4-(4-hydroxyphenyl)-5-oxo-4H-chromene-3-carbonitrile (1k) (Xu et al, 2011), 2-amino-5,6,7,8-tetrahydro-4-(furan-2-yl)-5-oxo-4H-chromene-3-carbonitrile (1m) (Xu et al, 2011), 2-amino-5,6,7,8-tetrahydro-4-(3,4-dimethoxyphenyl)-5-oxo-4H-chromene-3-carbonitrile (1q) (Yu and Da-Ming, 2012;Xu et al, 2011), 2-amino-5,6,7,8-tetrahydro-4-(4-chlorophenyl)-5-oxo-4H-chromene-3-carbonitrile (1s) (Yu and Da-Ming, 2012;Rostamnia and Morsali, 2014;HosseiniMonfared et al, 2013), 2-amino-5,6,7,8-tetrahydro-4-(3-nitrophenyl)-5-oxo-4H-chromene-3-carbonitrile (1v) (Xu et al, 2011), 2-amino-5,6,7,8-tetrahydro-7,7-dimethyl-5-oxo-4-phenyl-4H-chromene-3-carbonitrile (2a) (Kumar et al, 2009;Sadegh and Ali, 2014;Yu and Da-Ming, 2012;Gao et al, 2008;Hasaninejad et al, 2013;Jiang-Cheng et al, 2011;Bihani et al, 2013;Khaksar et al, 2012;Banerjee et al, 2011), 2-amino-5,6,7,8-tetrahydro-4-(4-fluorophenyl)-7,7-dimethyl-5-oxo-4H-chromene-3-carbonitrile (2b) …”