Compound a
This was synthesized using above scheme. R f 0.44 (Silica Gel G, n-hexane: EtOAc, 10:2);
IR (cm -1 ) 3067 (Aromatic C-H), 2985 (Aliphatic-CH2 ), 1678 (Aryl C = C), 1631 (C = O), 1452 (Aromatic ring stretch);
nmr
(400 MHz, DMSO-d6), dH ppm: 2.469 (1H, s), 3.025-3.006 (4H, q, J = 7.6 Hz), 1.258-1.240 (3H, t, J = 7 Hz), 6.998 (1H, m), 7.126 (1H, m), 7.254 (1H, m), 7.468 (1H, m), 7.536 (1H, m), 7.552 (1H, m), 8.076 (1H, m), 7.969 (1H, s), 7.900 (1H, s), 8.605 (1H, s); m ⁄ z 507.13(M+).
http://www.japtr.org/article.asp?issn=2231-4040;year=2014;volume=5;issue=1;spage=28;epage=32;aulast=Nayak
