Synthetic studies towards novel tetracyclic lycopodium alkaloids: a synthesis of deoxymagellaninone

Mehta, Goverdhan ; Sreenivasa Reddy, M. ; Thomas, Abraham (1998) Synthetic studies towards novel tetracyclic lycopodium alkaloids: a synthesis of deoxymagellaninone Tetrahedron, 54 (27). pp. 7865-7882. ISSN 0040-4020

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00404...

Related URL: http://dx.doi.org/10.1016/S0040-4020(98)00421-9

Abstract

A short, novel, linear triquinane-based strategy, directed towards the synthesis of complex tetracyclic alkaloids of paniculatine and magellanine-type, and culminating in the synthesis of deoxymagellaninone 32 is delineated. The cornerstone of our approach was the utilization of the 'carbocycle-heterocycle equivalency' stratagem to generate the N-methylpiperidine ring-D from a cyclopentene precursor, e.g. 35→38. The six-membered ring-A present in the natural products was constructed either through cationic enone-olefin cyclization (25→ 26) or intramolecular Michael addition (34→35) protocols. Overall, the synthetic effort outlined here is notable for its brevity, conceptual simplicity and desirable levels of regio- and stereoselective control in various steps.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Michael Reaction; Piperidines; Cyclopentenones; Alkaloids
ID Code:28986
Deposited On:18 Dec 2010 05:44
Last Modified:18 Dec 2010 05:44

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