A Benzyne Insertion Approach to Hetisine-Type Diterpenoid Alkaloids: Synthesis of Cossonidine (Davisine).

A Benzyne Insertion Approach to Hetisine-Type Diterpenoid Alkaloids: Synthesis of Cossonidine (Davisine).
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DOI:
10.1021/jacs.8b05043
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发表时间:
2018-07-05
影响因子:
15
通讯作者:
Sarpong R
Sarpong R
中科院分区:
化学1区
文献类型:
--
作者:
Kou KGM;Pflueger JJ;Kiho T;Morrill LC;Fisher EL;Clagg K;Lebold TP;Kisunzu JK;Sarpong R

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Hetisine类天然产物显示出二萜生物碱家族中最复杂的碳骨架之一。网络分析的使用使得一种合成策略能够通过A环上的羟基化来获得这类生物碱。关键的转化包括苯乙酰基烷基化以构建关键的稠合6-7-6三环,化学选择性的丁腈还原,以及通过还原环化和光化学氢胺化形成连续的C-N键以构建嵌入的氮杂双环。我们的战略应该能够在Hetisine类型中获得无数的天然和非天然产品。
The hetisine-type natural products exhibit one of the most complex carbon skeletons within the diterpenoid alkaloid family. The use of network analysis has enabled a synthesis strategy to access alkaloids in this class with hydroxylation on the A-ring. Key transformations include a benzyne acyl-alkylation to construct a key fused 6–7-6 tricycle, a chemoselective nitrile reduction, and sequential C–N bond formations using a reductive cyclization and a photochemical hydroamination to construct an embedded azabicycle. Our strategy should enable access to myriad natural and unnatural products within the hetisine-type.
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