Enantiopure 2-piperidylacetaldehyde as a useful building block in the diversity-oriented synthesis of polycyclic piperidine derivatives
摘要:
Novel, simple, and convenient strategies for diversely functionalized piperidine derivatives have been developed by using different metal catalyzed reactions starting from enantiopure (R)- and (S)-2-piperidylacetaldehyde. (C) 2011 Elsevier Ltd. All rights reserved.
Herein, a method for the enantioselective reduction of unprotected 2-alkylpyridines is reported for the first time. By using pinacolborane and an amide as reducing agents, a large number of 2-alkylpiperidines were synthesized with high yields and excellent enantioselectivities via a cascade process involving 1,4-hydroboration and subsequent transfer hydrogenation. The resulting products can be easily
Novel, simple, and convenient strategies for diversely functionalized piperidine derivatives have been developed by using different metal catalyzed reactions starting from enantiopure (R)- and (S)-2-piperidylacetaldehyde. (C) 2011 Elsevier Ltd. All rights reserved.
A new asymmetric entry to 2-substituted piperidines. A concise synthesis of (+)-coniine, (−)-pelletierine, (+)-δ-coniceine, and (+)-epidihydropinidine
A new asymmetric route to 2-substitutedpiperidines involving the Sharpless asymmetric dihydroxylation (AD) of 5-hexenylazide 1 and an intramolecular aminocyclization as crucial steps and its application to the asymmetric synthesis of four piperidine alkaloids, (+)-coniine 2, (−)-pelletierine 3, (+)-δ-coniceine 4, and (+)-epidihydropinidine 5 is presented.