Total Synthesis of the <i>Galbulimima</i> Alkaloids Himandravine and GB17 Using Biomimetic Diels–Alder Reactions of Double Diene Precursors
作者:Reed T. Larson、Ryan P. Pemberton、Jenna M. Franke、Dean J. Tantillo、Regan J. Thomson
DOI:10.1021/jacs.5b07710
日期:2015.9.2
enantioselective total syntheses of himandravine and GB17 were completed through a common biomimetic strategy involving Diels-Alder reactions of unusual double diene containing linear precursors. The double diene precursors, containing or lacking a C12 substituent as required to produce GB17 or himandravine, respectively, were found to undergo Diels-Alder reactions to afford mixtures of regioisomeric cycloadducts
作者:Samuel Chackalamannil、Robert Davies、Andrew T. McPhail
DOI:10.1021/ol010038w
日期:2001.5.1
[GRAPHICS]The first total synthesis of (+)-himandravine (1) is described, starting from (2S,6S)-cis-2-formyl-6-methyl-N-Boc-piperidine (8) in 11 linear steps and 17% overall yield. The key step involves a highly diastereoselective intramolecular Diels-Alder reaction of the key intermediate 5 that contains the entire latent carbon framework and functional group substitution of himandravine.
Biomimetic Total Synthesis of (+)-Himbacine
作者:Kirill Tchabanenko、Robert M. Adlington、Andrew R. Cowley、Jack E. Baldwin
DOI:10.1021/ol047676+
日期:2005.2.1
acid butenolide 14 undergoes N-Boc deprotection and condensation followed by an iminium ion activated intramolecular Diels-Alder cycloaddition to give the (+)-himbacine precursor 11 on reductive work up. Compound 11 was converted into (+)-himbacine in four synthetic steps. [reaction: see text]
RETRACTED: Biomimetic approach to Galbulimina type I alkaloids
作者:Kirill Tchabanenko、Richard Chesworth、Jeremy S. Parker、Neel K. Anand、Andrew T. Russell、Robert M. Adlington、Jack E. Baldwin
DOI:10.1016/j.tet.2005.09.050
日期:2005.12
On treatment with trifluoroacetic acid the tetraene precursor 23 underwent Boc deprotection, condensation and an iminium ion accelerated intramolecular Diels-Alder cycloaddition resulting in an iminium species 12, which was further converted into himbacine 1, himbeline 3 and himandravine 4, three out of four Galbulimina type I alkaloids thus providing strong evidence for the proposed biogenesis of this important family of alkaloids. (c) 2005 Elsevier Ltd. All rights reserved.