In this Chapter, we revisit the methodology developed in synthesizing 4-hydroxycoumarin analogues by adapting C3- and O-alkylation strategies using sulfated tin oxide as catalyst. In addition to describing the details of the synthetic strategies, including the biological activity performed, we offer a historical perspective of the development in the field.
Dr. Venugopala rao Narayana
Sri Santhoshi Matha Eductional Socity, Hyderabad-502032, India.
Dr. Ravi Varala
Scrips Pharma, Mallapur, Hyderabad-500076, India.
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