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A new gedunin, three new mexicanolides and three new phragmalin-type limonoids named Andirolides A (1), B (2), C (3), D (4), E (5), F (6), and G (7) were isolated from oil of the flower of Carapa guianensis Aublet (Meliaceae). Their absolute stereostructures were determined by 2D NMR and CD spectra, and single-crystal X-ray analysis, and all compounds were confirmed to have the C-17βH configuration...
Treatment of 2-benzothiopyrylium salt with alkenes such as styrene, p-methylstyrene, p-methoxystyrene, α-methylstyrene, and trans-anethole afforded the corresponding [4 + +2]-type polar cycloaddition products, respectively. The structures of the cycloadducts were confirmed by X-ray crystal structure determination of the corresponding sulfone derivative.
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