作者:Malte Brasholz、James M. Macdonald、Simon Saubern、John H. Ryan、Andrew B. Holmes
DOI:10.1002/chem.201001435
日期:——
The total synthesis of the spiropiperidine alkaloid (−)‐perhydrohistrionicotoxin (perhydro‐HTX) 2 has been accomplished on a gram scale by employing both conventional batch chemistry as well as microreactor techniques. (S)‐(−)‐6‐Pentyltetrahydro‐pyran‐2‐one 8 underwent nucleophilic ring opening to afford the alcohol 10, which was elaborated to the nitrone 13. Protection of the nitrone as the 1,3‐adduct
螺哌啶生物碱(-)-全氢组氨酸毒素(perhydro-HTX)2的总合成已通过常规分批化学方法和微反应器技术以克为单位完成。(S)-(-)-6-戊基四氢吡喃-2-酮8经过亲核开环得到醇10,该醇被精制为腈13。硝酮如苯乙烯和侧链延伸的1,3-加合物,得到的前体的不饱和腈的保护17,后行偶极裂环和1,3-偶极环加成,得到芯螺环前体18,将其转变成全氢‐HTX 2。通过使用不同类型的微反应器并以可伸缩的方式,已将进入螺旋旋流器18的主要步骤成功地转换成流动模式,从而允许通过连续加工更快速地获得组氨酸毒素及其类似物。