Synthesis 2015; 47(15): 2299-2316
DOI: 10.1055/s-0034-1380215
paper
© Georg Thieme Verlag Stuttgart · New York

Stereoselective Total Synthesis of the Diastereomeric Tricyclic Alkaloids Tetraponerine-7 and Tetraponerine-8 Using O-Pivalo­ylated d-Arabinopyranosylamine as the Common Auxiliary

Irina Strassnig
a   Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10–14, 55128 Mainz, Germany   eMail: hokunz@uni-mainz.de
,
Karsten Körber
b   GBA/IO, Global Research Insecticide Chemistry, Crop Protection, BASF SE, Carl-Bosch-Str. 38, 67056 Ludwigshafen, Germany
,
Udo Hünger
c   E-EDK/K, Global Key Account Management, BASF SE, Carl-Bosch-Str. 38, 67056 Ludwigshafen, Germany
,
Horst Kunz*
a   Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10–14, 55128 Mainz, Germany   eMail: hokunz@uni-mainz.de
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Publikationsverlauf

Received: 23. März 2015

Accepted after revision: 21. April 2015

Publikationsdatum:
11. Juni 2015 (online)


Dedicated to Professor Richard R. Schmidt on the occasion of his 80th birthday

Abstract

Based on a diastereoselective domino Mannich–Michael reaction cascade of 2-N-[(S)-3-{(benzyloxycarbonyl)[4-(tert-butyldiphenylsiloxy)butyl]amino}octylidene]-2,3,4-tri-O-pivaloyl-α-d-arabinopyranosylamine with the Danishefsky diene, the major component of the neurotoxic venom of the New Guinean ant Tetraponera punctulata, tetraponerine-8, and its diastereomer tetraponerine-7 were synthesized in pure form. While the Mannich reaction of the arabinosyl imine of the required (S)-configured β-aminoaldehyde gave the 2-substituted piperidinone precursor of tetraponerine-8 with excellent diastereoselectivity, the analogous Mannich reaction of the (R)-configured β-aminoaldehyde afforded the precursor of tetraponerine-7 with a selectivity of only 2:1 (mismatched case). The enantiomerically pure tetraponerine-8, described as highly toxic for ants, exhibited only moderate toxicity to sucking and stinging insects.

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