Studies in Polyphenol Chemistry and Bioactivity. 3.<sup>1</sup><sup>,</sup><sup>2</sup> Stereocontrolled Synthesis of Epicatechin-4α,8-epicatechin, an Unnatural Isomer of the B-Type Procyanidins
作者:Alan P. Kozikowski、Werner Tückmantel、Youhong Hu
DOI:10.1021/jo001462y
日期:2001.2.1
of the "top" 3-hydroxyl group in 28c compared with its 4beta,8-isomer 3. The preparation of compounds 14 and 17 containing phloroglucinol trimethylether in the 4alpha and 4beta linkages to epicatechin is also described. The 8-position of the bromine atom in 19, previously conjectured in analogy to the structurally characterized tetramethyl ether 20, was confirmed by transformation of both compounds