Further Investigation of the Intermolecular Diels-Alder Cycloaddition for the Synthesis of Bicyclo[2.2.2]diazaoctane Alkaloids.
Further Investigation of the Intermolecular Diels-Alder Cycloaddition for the Synthesis of Bicyclo[2.2.2]diazaoctane Alkaloids.
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DOI:
10.1021/acs.joc.7b02403
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发表时间:
2017-12-15
期刊:
影响因子:
--
通讯作者:
Scheerer JR
中科院分区:
文献类型:
--
作者:
Perkins JC;Wang X;Pike RD;Scheerer JR
The convergent synthesis of bicyclo[2.2.2]diazaoctane structures using an intermolecular Diels−Alder cyclo-addition between a pyrazinone and commercially available fumarate or maleate precursors is reported. High reactivity and stereoselection is observed with both dienophile substrates. Structure validation was achieved by conversion of cycloadducts into known [2.2.2]diazabicyclic compounds or into crystalline derivatives suitable for X-ray analysis. The cycloadduct derived from reaction of pyrazinone and maleic anhydride underwent selective anhydride ring opening and intersected an established precursor in the synthesis of brevianamide B.
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