Synthesis of podophyllotoxin analogues: δ-lactone-containing picropodophyllin, podophyllotoxin and 4′-demethyl-epipodophyllotoxin derivatives
作者:Philippe Meresse、Claude Monneret、Emmanuel Bertounesque
DOI:10.1016/j.tet.2004.01.017
日期:2004.3
cyano group, led to the trans δ-lactone 5 (7 steps from 1 and 6% overall yied) with a small amount of its C-4 epimer 6. The synthesis of non-epimerizable δ-lactone analogues of 4′-demethyl-epipodophyllotoxin 7 and of 4-demethyl podophyllotoxin 8 are also reported. The synthesis of 7 and 8 was based upon the reduction of the γ-lactone ring of 4′-demethyl-4-epipodophyllotoxin followed by selective protection
已经制备了鬼臼毒素的不可表位的顺式和反式δ-内酯类似物。因此,通过将γ内酯环还原成反式二醇,选择性保护4-OH和11-OH作为亚苄基乙缩醛,鬼臼毒素1的合成已经完成了8个步骤,并且鬼臼毒素1的总收率为4%,从而实现了顺式异构体4的合成。,以及Wittig在C-13处的延伸,以及C-2处的构型反转。在C-13处具有相同的伸长率,但通过形成甲磺酸酯和引入氰基基团,产生了带有少量C-4差向异构体的反式δ-内酯5(从1和6%的总收率起7步)6。还报道了4'-脱甲基-表鬼臼毒素7和4-脱甲基鬼臼毒素8的不可表位的δ-内酯类似物的合成。7和8的合成是基于还原4'-去甲基-4-表鬼臼毒素的γ-内酯环,然后在C-11处进行选择性保护,并在C-13处进行延伸。(总产量的8-15%和4%)。化合物4,5和7没有对L1210鼠白血病显示体外相关的细胞毒性。