Neat total synthesis of six monoterpenic alkaloids of the actinidine series |
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Authors: | Nicolas Robert |
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Institution: | Laboratoire de Chimie Organique Fine et Hétérocyclique, UMR CNRS 6014, INSA and University of Rouen, ECOFH-IRCOF, INSA de Rouen, BP 08, 76131 Mont-Saint-Aignan Cedex, France |
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Abstract: | A concise enantiopure synthesis of six monoterpenic alkaloids of the actinidine series possessing a cyclopentac]pyridine skeleton, (+)-deoxyrhexifoline (4), (+)-boschniakinic acid (5), (+)-boschniakine (6), (−)-plantagonine (7), (−)-indicaine (8) and (−)-tecostidine (9) is reported starting with the chiral precursor 3-bromo-5-((4R)-phenyloxazolin-2-yl)pyridine (10). It involves a C-4 regioselective connection of a butene appendice and an intramolecular 5-exo-trig Heck annulation sequence followed by hydrogenation of the exocyclic alkene. Mixture of (3R)- and (3S)-7-((4R)-phenyloxazolin-2-yl)cyclopentac]pyridines was separated by HPLC before being transformed into enantiopure natural products (4-9) by modification of the oxazoline group. |
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Keywords: | Nucleophilic addition Intramolecular Heck reaction Oxazoline Pyridine alkaloid Pyridoterpene |
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