Studies in Polyphenol Chemistry and Bioactivity. 4.<sup>1</sup> Synthesis of Trimeric, Tetrameric, Pentameric, and Higher Oligomeric Epicatechin-Derived Procyanidins Having All-4β,8-Interflavan Connectivity and Their Inhibition of Cancer Cell Growth through Cell Cycle Arrest<sup>1</sup>
作者:Alan P. Kozikowski、Werner Tückmantel、Gesine Böttcher、Leo J. Romanczyk
DOI:10.1021/jo020393f
日期:2003.3.1
members was demonstrated using a dimeric electrophile obtained by self-condensation of compound 12. Both the synthetic and natural pentamer 32 inhibit the growth of several breast cancer cell lines. Using the MDA MB 231 line, it was established that this outcome is based on the induction of cell cycle arrest in the G0/G1 phase. Subsequent cell death is more likely necrotic rather than apoptotic. Control
我们报道了从5,7,3',4'-四-O-苄基表儿茶素(( 1)和5,7,3',4'-四-O-苄基-4-(2-羟基乙氧基)表儿茶酸(2),方法是用粘土矿物膨润土K-10代替先前使用的路易斯酸四氯化钛。在相同条件下,从苄基保护的全4β,8-三聚体,-四聚体和-戊二聚体是从它们的较低同系物区域选择性地获得的,尽管产率迅速降低。2与2-巯基苯并噻唑和三甲基铝生成的有机硫醇铝反应,然后乙酰化,生成3-O-乙酰基-4-[(2-苯并噻唑基)硫代] -5,7,3',4'-四-O-苄基表儿茶素(12)。具有4beta的中型受保护寡聚物,通过使用该化合物作为亲电子试剂和四氟硼酸银作为活化剂,可以提高产率获得8-黄酮键,并通过反相HPLC进行分离。通过酯皂化然后氢解将它们脱保护,得到游离的原花青素,其特征为过乙酸盐。通过正相HPLC,合成的原花青素与从可可中分离出的馏分相同。使用通过化合物12的自缩合获得的二聚