Divergent total synthesis of crassalactones B and C and evaluation of their antiproliferative activity
作者:Goran Benedeković、Ivana Kovačević、Mirjana Popsavin、Jovana Francuz、Vesna Kojić、Gordana Bogdanović、Velimir Popsavin
DOI:10.1016/j.tet.2015.05.040
日期:2015.7
diacetone d-glucose (4) as a chiral precursor. The key steps of the synthesis of both targets 2 and 3 were a stereo-selective addition of phenyl magnesium bromide to a dialdose derivative, a regioselective introduction of the cinnamic acid residue, and a stereospecific furano-lactone ring formation by cyclocondensation of a suitable hemiacetal derivative with Meldrum's acid. No protection is necessary
通过利用双丙酮d-葡萄糖(4)作为手性前体,实现了细胞毒性天然产物(+)-内酯B(2)和C(3)的不同总合成。合成靶标2和3的关键步骤是将苯基溴化镁立体选择性地添加到二糖衍生物中,肉桂酸残基的区域选择性引入以及通过合适的半缩醛的环缩形成立体特异性的呋喃内酯环。麦德鲁姆酸的衍生物。合成(+)-crassalactone C(3不需要保护),除了在商业上可获得的起始原料4中已经存在的双丙酮化物功能。由相同的起始原料制备(+)-克拉内酯B(2),需要在整个合成过程中使用单个甲硅烷基醚保护基。评价合成的天然产物对PC3,HT29和A549人肿瘤细胞系的体外抗增殖活性。