Total synthesis of cis-clerodane diterpenoids: (–)-agelasine A and (+)-(3R,4S,5R,8S,9R,10S)-3,4-epoxyclerod-13-en-15,16-olide
摘要:
The preparation of the enantiomerically homogeneous bicyclic iodide 26 and its use as a key intermediate for the total syntheses of the cis-clerodane diterpenoids (-)-agelasine A 5 and (+)-(3R,4S,5R,8S,9R,10S)-3,4-epoxyclerod-13-en-15,16-olide 6 are described.
Agelasine-A, -B, -C and -D, novel bicyclic diterpenoids with a 9-methyladeninium unit possessing inhibitory effects on na,K-atpase from the okinawa sea sponge sp.1)
Agelasine-A, -B, -C and -D, novel bicyclic diterpenoids having inhibitoryeffects on enzymic reactions of Na,K-ATPase, have been isolatedfrom the orange colored Okinawanseasponge Agelas sp. and the structures have been determined on the basis of their spectral data and chemical conversions.