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Velutabularins A–J, ten novel phragmalin-type limonoids, were isolated from the stem bark of Chukrasia tabularis var. velutina. In structures of 1–6, the tetrahydrofuran ring from dehydration of OH-15 and OH-17, ring C and 13/14/18-cyclopropanyl moiety formed an unprecedented 8-oxatricyclo[4,3,1 1,6 ]decane. Compounds 7–10 are derivates of 1–6 opening the tetrahydrofuran ring. All of these...
Chukvelutilides A–F (1-6), a new class of C-15-acyl phragmalin type limonoids, featuring a C-16/C-30 δ-lactone ring, were isolated from Chukrasia tabularis var. velutina. These compounds are suggested to possess a three- or four-carbon enolized acyl substituent at C-15 through a plausible biosynthetic origin. Their structures were elucidated by extensive spectroscopic means, and that of 1 was confirmed...
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