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DOI: 10.1055/s-0030-1259553
Cyclization of Aminocyclopropanes in Indole Alkaloids Synthesis
Publication History
Publication Date:
11 February 2011 (online)

Abstract
The regioselective and diastereoselective cyclization of acyliminium intermediates generated from aminocyclopropanes on unprotected indoles is presented. The recent results obtained in our group are compared with previous intermolecular reactions with aminocyclopropanes as well as with other cyclization methods involving iminium ions and unprotected indoles. A first speculative analysis of possible reaction mechanisms allows rationalizing the observed selectivity. The high potential of the method for the synthesis of natural alkaloids is demonstrated in the formal synthesis of aspidospermidine and the total synthesis of goniomitine.
Key words
alkaloids - cyclization - indoles - iminium - aminocyclopropanes
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References and Notes
The biological assays were done in the laboratory of Prof. Jürg Gertsch at the University of Bern in the framework of a COST CM0804 (Chemical Biology with Natural Products) collaboration.