Catalytic Asymmetric Synthesis of (<i>R</i>)-(-)-Calycotomine, (<i>S</i>)-(-)-Salsolidine and (<i>S</i>)-(-)-Carnegine
作者:Takashi Itoh、Takuya Kanemitsu、Yuki Yamashita、Kazuhiro Nagata
DOI:10.1055/s-2006-941586
日期:2006.6
A simple and efficient procedure for a synthesis of isoquinoline alkaloids is described. The key step of the synthesis was a hydrocyanation of 6,7-dimethoxy-3,4-dihydroisoqunoline giving the corresponding 1-cyano-l,2,3,4-tetrahydroisoquinoline. The asymmetric Strecker reaction was accomplished in high yield and high enantiomeric excess using Jacobsen's thiourea-containing catalyst. The 1-cyanoisoquinoline
描述了一种简单有效的异喹啉生物碱合成方法。合成的关键步骤是 6,7-二甲氧基-3,4-二氢异喹啉的氢氰化反应,得到相应的 1-氰基-1,2,3,4-四氢异喹啉。使用 Jacobsen 的含硫脲催化剂,不对称 Strecker 反应以高产率和高对映体过量完成。由此获得的1-氰基异喹啉转化为天然产物,(R)-(-)-calycotomine、(S)-(-)-salsolidine和(S)-(-)-camegine。