Description:Ingenol is a diterpenoid related to phorbol, derived from the milkweed plant E. peplus.1 It is a protein kinase C activator that displays a Ki value of 30 μM and an ED50 value of 27 μM in vitro. Most ingenol esters are tumor-promoting. However, ingenol mebutate possesses anti-tumor activity when used topically for actinic keratosis.
Chemical Properties:Isolated in 1968, ingenol, a highly oxygenated tetracyclic diterpene classified as a member of the phorboid family, is the parent compound of several dozen naturally occurring ingenanes that possess the same carbon skeleton but varied peripheral functionalities. In addition to their intriguing “inside-outside” bridged BC ring system, the ingenanes display interesting biological profiles that range from tumorpromoting to anti-leukemic and anti-HIV activities. Since the early 1980s, this combination of important biological function and complex architecture has inspired the efforts of numerous synthetic chemists.4 Previously, we reported an approach toward 1 wherein known â-ketoester 2 was advanced to diene 3, which served as a ring-closing metathesis substrate in a first generation Grubbs reaction that delivers the ingenane tetracycle 4.
Uses:analogue of Ingenol 3-Angelate, which has anti-tumor activity when used topically for the treatment of actinic keratosis.
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