Synthesis of Chiral 1-Substituted Tetrahydroisoquinolines by the Intramolecular 1,3-Chirality Transfer Reaction Catalyzed by Bi(OTf)<sub>3</sub>
作者:Nobuyuki Kawai、Ryuzou Abe、Mika Matsuda、Jun’ichi Uenishi
DOI:10.1021/jo102452d
日期:2011.4.1
The intramolecular 1,3-chirality transfer reaction of chiral amino alcohols 1 with 99% ee was developed to construct chiral 1-substituted tetrahydroisoquinoline 2. Bi(OTf)3 (10 mol %)-catalyzed cyclization of 1 (R = H) afforded (S)-1-(E)-propenyl tetrahydroisoquinoline 2 (R = H) in 83% yield with a ratio of 98:2. The stereochemistry at the newly formed chiral center was produced by a syn SN2′-type
开展了手性氨基醇1与99%ee的分子内1,3-手性转移反应,构建了手性1取代的四氢异喹啉2。Bi(OTf)3(10 mol%)催化1的环化反应(R = H)得到(S)-1-(E)-丙烯基四氢异喹啉2(R = H),产率为83:2,比率为98:2 。在新形成的手性中心的立体化学是通过syn S N 2'型过程产生的。在该反应中,苯环1上的取代基显着影响反应性和选择性。提出了合理的反应机理。