Stereoselective synthesis of tetrahydroisoquinoline alkaloids: (−)-trolline, (+)-crispin A, (+)-oleracein E
作者:Nobuyuki Kawai、Mika Matsuda、Jun’ichi Uenishi
DOI:10.1016/j.tet.2011.09.033
日期:2011.11
have been synthesized stereoselectively from the both enantiomers of common intermediate (S)-4 and (R)-4. The key step in the synthesis include a stereoselective Bi(OTf)3-catalyzed intramolecular 1,3-chirality transfer reaction of chiral non-racemic amino allylic alcohols (S)-6 and (R)-6 to construct both enantiomers of (E)-1-propenyl tetrahydroisoquinoline 4.
四氢异喹啉生物碱,(S)-(-)-花环素,(R)-(+)-crispin A和(R)-(+)-oleracein E是由常见中间体(S)的两种对映异构体立体选择性合成的- 4和(- [R )- 4。合成的关键步骤包括立体选择性Bi(OTf)3催化的手性非外消旋氨基烯丙基醇(S)-6和(R)-6的分子内1,3-手性转移反应,以构建(E的两个对映异构体)-1-丙烯基四氢异喹啉4。