Asymmetric synthesis of highly functionalized tyrosine derivatives for the construction of bistetrahydroisoquinoline alkaloids
作者:Enming Du、Xuan Pan、Baohe Guan、Zhanzhu Liu
DOI:10.1016/j.tetlet.2018.07.003
日期:2018.8
A novel and facile synthesis of l-5-hydroxy-2,4-methoxy-3-methylphenylalanine derivatives, which are the key coupling partners for the asymmetric total synthesis of natural bistetrahydroisoquinoline alkaloids, is realized starting from l-tyrosine with 17% overall yield. The synthesis has been carried out on a multigram scale featuring the following key steps: (a) transformation of phenol to dihydroquinone
一种新颖的和的简便合成升-5-羟基-2,4-甲氧基-3-甲基苯丙氨酸衍生物,其耦合伙伴自然bistetrahydroisoquinoline生物碱的不对称全合成的关键,实现从开始升-酪氨酸与整体17%屈服。合成已经以克为单位进行,其特征在于以下关键步骤:(a)苯酚通过水杨酸催化的氧化反应转化为二氢醌,然后还原锌乙酸盐;(b)二氢醌的单TBS保护;(c)新产生的酚羟基的Mitsunobu甲基化。