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Six limonoids, trijugins D–H (1–5) and methyl 8α-hydroxy-8,30-dihydroangolensate (6), two degraded limonoids, trichiconnarins A and B (7–8), and a pregnane steroid, 3β,4α-dihydroxypregnan-21-one (9), along with the known trijugin C (10) and 3β,4α-dihydroxypregnan-16-one (11) were isolated from twigs and leaves of Trichilia connaroides. Their structures were established on the basis of extensive spectroscopic...
Two novel limonoids, swiemahogins A (1) and B (2) isolated from the twigs and leaves of Swietenia mahogany, are the first examples of andirobin and phragmalin types of limonoids, of which the D-ring δ-lactone is demolished and a rare γ-lactone is fused to the C-ring at C-8 and C-14. Their structures were elucidated by extensive spectroscopic means, and that of 1 was confirmed by single-crystal X-ray...
Three new pregnane steroids, 2β,3β,5β-trihydroxy-pregn-20-en-6-one (1), 3β-hydroxy-5α-pregn-7,20-dien-6-one (2), and 3β-acetoxy-5α-pregn-7,20-dien-6-one (3) were isolated from the twigs and leaves of Turraea pubescens, and were structurally elucidated on the basis of spectroscopic data and chemical method.
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