Chemistry of the annonaceae. Structures of uvarindoles A—D, four new benzylated indole alkaloids from Uvaria angolensis

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Abstract
Uvaria angolensis stem bark has yielded four alkaloids based on indole substituted with between two and four 6-hydroxybenzyl units; uvarindoles A (1) and B (2) are indentified as indole so substituted at the 1,2,3 and 1,2,3,5 positions respectively, uvarindole C (3) as a 2,3-substituted indole with as the 2 substituent a hydroxybenzoyl unit, and uvarindole D (4) as a dihydroindol-3-one with one hydroxybenzyl unit situated at N(1)and with two units at C(2).

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