Synthesis of chiral 1-substituted tetrahydroisoquinolines by the intramolecular 1,3-chirality transfer reaction catalyzed by Bi(OTf)3 |
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Authors: | Kawai Nobuyuki Abe Ryuzou Matsuda Mika Uenishi Jun'ichi |
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Institution: | Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto 607-8412, Japan. kawai@mb.kyoto-phu.ac.jp |
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Abstract: | 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 S(N)2'-type process. In this reaction, the substituent on the benzene ring of 1 significantly affected the reactivities and selectivities. A plausible reaction mechanism was proposed. |
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