The pharmacologically interesting indole alkaloids (â)-mitragynine, (+)-paynantheine and (+)-speciogynine were synthesised in nine steps from 4-methoxytryptamine by a route featuring (i) an enantioselective thiourea-catalysed PictetâSpengler reaction, providing the tetrahydro-β-carboline ring and (ii) a Pd-catalysed TsujiâTrost allylic alkylation, closing the D-ring.
药理学上有趣的
吲哚生物碱(–)-米曲尔宁、(+)-派南亭和(+)-特氏
生物碱通过九步反应从4-甲氧基色
氨酸合成,反应路线包括(i)一种对映选择性的
硫脲催化的Pictet–Spengler反应,形成四氢-β-卡巴啉环;(ii)一种
钯催化的Tsuji–Trost邻位烷基化反应,闭合D环。