Stereoselective synthesis of O-tosyl azabicyclic derivatives via aza Prins reaction of endocyclic N-acyliminium ions: application to the total synthesis of (±)-epi-indolizidine 167B and 209D
作者:Anil K. Saikia、Kiran Indukuri、Jagadish Das
DOI:10.1039/c4ob01130a
日期:——
A diastereoselective protocol has been established for the synthesis of 4-O-tosyl piperidine containing hexahydroindolizin-3(2H)-one, hexahydro-1H-quinolizin-4(6H)-one and 1,3,4,10b-tetrahydropyrido[2,1-a]isoindol-6(2H)-one derivatives via the aza-Prins cyclization reaction of cyclic N-acyliminium ions mediated by p-toluene sulphonic acid (p-TSA) under mild conditions. The reaction is highly diastereoselective
已经建立了非对映选择性的方案,用于合成含有六氢吲哚并嗪-3(2 H)-one,六氢-1 H-喹啉嗪-4(6 H)-one和1,3,4,10b-的4 - O-甲苯磺酰基哌啶四氢吡啶并[2,1-一个]异吲哚-6(2 ħ) -酮衍生物经由环状的氮杂普林斯环化反应ñ通过介导-acyliminium离子p -甲苯磺酸(p -tsa)在温和条件下。该反应是高度非对映选择性的,并产生优异的产率。该方法已应用于吲哚并立定生物碱的有效全合成(±)-Epi-吲哚唑烷167B和209D。