Acridone Alkaloids.

There have been substantial developments in the chemistry and biology of the acridone alkaloids in the 16years since the topic was last reviewed in this series of monographs (2000). The present survey covers the literature from mid-1999 to 2016. A brief overview of the biosynthesis of acridone alkaloids is followed by details of the occurrence and characterization of known alkaloids from new sources, and of novel alkaloids. The classes covered include simple acridone alkaloids, C-prenylacridones, furo[3,2-b]- and furo[2,3-c]acridones, pyrano[3,2-b]- and pyrano[2,3-c]acridones, and dimeric alkaloids containing acridone moieties. Syntheses of acridone alkaloids and certain analogs reported during the review period are comprehensively covered. The final section summarizes aspects of their bioactivity, including cytotoxicity and anticancer activity, antimicrobial and antiparasitic properties, and enzyme inhibition. The chapter concludes with a brief description of important bioactive synthetic analogs.