A synthesis of alsmaphorazine B demonstrates the chemical feasibility of a new biogenetic hypothesis.

A synthesis of alsmaphorazine B demonstrates the chemical feasibility of a new biogenetic hypothesis.
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DOI:
10.1021/jacs.5b04686
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发表时间:
2015-06-17
影响因子:
15
通讯作者:
Vanderwal CD
Vanderwal CD
中科院分区:
化学1区
文献类型:
--
作者:
Hong AY;Vanderwal CD

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An N-oxide fragmentation/hydroxylamine oxidation/intramolecular 1,3-dipolar cycloaddition cascade efficiently converted an oxidized congener of akuammicine into the complex, hexacyclic architecture of the alsmaphorazine alkaloids. This dramatic structural change shows the chemical feasibility of our novel proposal for alsmaphorazine biogenesis. Critical to these endeavors was a marked improvement in our previously reported Zincke aldehyde cycloaddition approach to indole alkaloids, which permitted the gram-scale synthesis of akuammicine. The chemoselective oxidations of akuammicine leading up to the key rearrangement also generated several biogenetically related alkaloids of the alstolucine and alpneumine families.
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