標題: Diastereoselective Synthesis of Bridged Polycyclic Alkaloids via Tandem Acylation/Intramolecular Diels-Alder Reaction
作者: Chen, Chih-Hau
Yellol, Gorakh S.
Tsai, Cheng-Hsun
Dalvi, Prashant B.
Sun, Chung-Ming
應用化學系
Department of Applied Chemistry
公開日期: 4-十月-2013
摘要: A mild and efficient stereoselective synthesis of hexacyclic indole alkaloids with a tetrahydro-beta-carboline motif has been developed by utilizing the Pictet-Spengler reaction and tandem N-acylation followed by intramolecular Diels-Alder cyclization. Initially, a diene unit was installed in the tetrahedron beta-carboline skeleton through Pictet-Spengler cyclization of the corresponding aldehyde with tryptophan ester. The dienophile moiety was introduced by N-acylation of tetrahydro-beta-carboline. Successive, in situ, [4 + 2] intramolecular Diels-Alder cycloaddition of the activated dienophile and conjugated diene containing intermediate furnished bridged polycyclic heterocycles with high diastereoselectivity. Formation of four new rings, five new covalent bonds, and five new chiral centers with excellent stereoselectivity is the key, feature of this strategy. The diastereoselective formation of product was attributed to intramolecular chirality transfer through a chiral amino acid. The stereoselective outcome of this tandem reaction was confirmed by X-ray crystallographic studies. The developed synthetic strategy was also explored on a soluble polymer support to incorporate the advantage of rapid synthesis and a high throughput workup process toward the development of a green synthetic protocol for polycyclic alkaloids.
URI: http://dx.doi.org/10.1021/jo401364s
http://hdl.handle.net/11536/23304
ISSN: 0022-3263
DOI: 10.1021/jo401364s
期刊: JOURNAL OF ORGANIC CHEMISTRY
Volume: 78
Issue: 19
起始頁: 9738
結束頁: 9747
顯示於類別:期刊論文


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