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    Author(s): Johann F.W. Burger; Herbert Kolodziej; Richard W. Hemingway; Jan P. Steynberg; Desmond A. Young; Daneel Ferreira
    Date: 1990
    Source: Tetrahedron 46(16):5733-5740
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.1 MB)


    Procyanidin B-2 3 is subject to facile C-ring isomerizations in 0.1M NaHCO3 solution to form a novel series of 3,4,9,1o-tetrahydro-2H,8H-pyrano[2,3-h]chromenes 7, 9, and 10. The low percentage conversion of B- to A-type procyanidin 2 is rationalized in terms of an initial oxidative removal of hydride ion at C-2 (C-ring).

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    Burger, Johann F.W.; Kolodziej, Herbert; Hemingway, Richard W.; Steynberg, Jan P.; Young, Desmond A.; Ferreira, Daneel. 1990. Oligomeric flavanoids. Part 15a. Base-catalyzed pyran rearrangements of procyanidin B-2, and evidence for the oxidative transformation of B- to A-type procyanidins. Tetrahedron 46(16):5733-5740

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