A New Abietane and Two Dimeric Abietane Diterpenes from the Black Heartwood of Cryptomeria japonica

Abstract

Three new diterpenes, sugikurojins A—C (1—3) were isolated from the black heartwood of Cryptomeria japonica. The structure of sugikurojin A was deduced to be 19-hydroxy-6,7-dehydroferruginol on the basis of extensive NMR experiments. Sugikurojin B was a dimer of 6,7-dihydroxyferruginol and 6,7-dehydroferruginol with a 6-O-11′ linkage. Sugikurojin C was a dimeric ferruginol with 6-O-7′ and 7-O-6′ linkages. Also obtained in this investigation were the known compounds formosaninol (4), 15 sesquiterpenes (5—19), 16 diterpenes (20—35), three phenylpropanoids (36—38), and a phenolic compound (39).