A series of glycosylation and alkylation reactions of 6-phenanthernyl-2-pyridone derivatives 1a,b containing electron withdrawing and electron donating substituents at 4-position is reported. Regioselective
2-O-alkylated/glycosylated products were obtained exclusively, irrespective of the electronic nature of
alkylating or the glycosyling agent. Glycosylation of 1a,b with glucosyl/galactosyl and lactosyl bromides
afforded 2a,b; 4a,b; and 6a, respectively. Alkylation of 1a,b with epichlorohydrin, propargyl, allyl bromides, and 3-chloropropanol resulted in compounds 8-10 and 13, respectively. Deprotection of
O-glycosylated products under conventional conditions provided the free glycosides 3a,b; 5a,b; 7a,12;
and 13, respectively. The minimal inhibitory concentration for some of the newly synthesized compounds
showed high significant activity against Gram (+ve) and Gram (ve) and antifungal activities. Among the
screened compounds, the 4-trifluromethyl phenyl derivatives 2a, 3a, 4a, 8a, and 11a exhibited strong antimicrobial activity. |
