Tannins and Related Compounds. LIX. Aesculitannins, Novel Proanthocyanidins with Doubly-Bonded Structures from Aesculus hippocastanum L.(Organic,Chemical)

概要

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A chemical examination of the seed shells of Aesculus hippocastanum L. has led to the isolation of proanthocyanidins A-6 (10) and A-7 (11), and aesculitannins A(12), B(13), C(14), D(15), E(16), F(17) and G(18). On the basis of chemical and spectroscopic evidence, proanthocyanidins A-6(10) and A-7(11) have been determined to be A-type dieters each possessing a C-4, C-6 interflavanoid linkage, while aesculitannins A(12), B(13), C(14), D(15), E(16), F(17) and G(18) have been characterized as oligomeric proanthocyanidins possessing A-type unit(s) in each molecule. In addition, the presence of (-)-epicatechin (1), proanthocyanidins B-2(2), B-5(3), A-2(4), A-4(5) and C-1(6), epicatechin-(4β→6)-epicatechin-(4β→6)-epicatechin(7), and cinnamtannins B_1(8) and B_2(9) was also demonstrated.
公益社団法人日本薬学会の論文
1987-12-25