Gao P, Liu Y, Zhang L, Xu PF, Wang S, Lu Y, He M, Zhai H. Total Synthesis of Indole Alkaloid (±)-Subincanadine F via SmI2-Mediated Ring Opening and Bridge-Forming Mannich Reaction.
J Org Chem 2006;
71:9495-8. [PMID:
17137380 DOI:
10.1021/jo061724h]
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Abstract
The first total synthesis of (+/-)-subincanadine F, a bioactive indole alkaloid structurally featuring a 1-azabicyclo[4.3.1]decane unit, has been realized from 1-(para-methoxybenzyl)tryptamine in six steps. The bridge-containing tetracyclic framework of subincanadine F was efficiently assembled by a SmI2-mediated ring opening followed by an acid-mediated Mannich reaction. In addition, the tetracyclic ketoester 6, a key intermediate potentially useful for synthesizing structurally related indole alkaloids as well, was obtained in one step from alpha,beta-diketoester 5.
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