Pinguisone derivatives from an axenic culture of the liverwort Aneura pinguis
摘要:
Three new pinguisane-type sesquiterpenes, 6 alpha-hydroxy-3-oxo-pinguis-5(10)-ene-11,6-olide, 6 alpha-methoxy-3-oxo-pinguis-5(10)-ene-11,6-olide and 3-oxo-pinguis-5(10),6-diene-11,6-olide, together with pinguisone, have been isolated from axenic culture of the liverwort, Aneura pinguis. Their structures and relative stereochemistry were elucidated on the basis of spectroscopic evidence and chemical transformation.
A stereoselective totalsynthesis of pinguisone (1) from the known (S)-(+)2,3,7,7a-tetrahydro-7a-methyl-6H-indene-1,5-dione (3) is described. The utilization of common intermediates in the synthesis of pinguisone-like and 7-epi-pinguisone-like compounds is discussed.