Total synthesis of (+)-azaspiracid-1. An exhibition of the intricacies of complex molecule synthesis.

Total synthesis of (+)-azaspiracid-1. An exhibition of the intricacies of complex molecule synthesis.
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DOI:
10.1021/ja804659n
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发表时间:
2008-12-03
影响因子:
15
通讯作者:
Favor, David A.
Favor, David A.
中科院分区:
化学1区
文献类型:
--
作者:
Evans, David A.;Kvaerno, Lisbet;Dunn, Travis B.;Beauchemin, Andre;Raymer, Brian;Mulder, Jason A.;Olhava, Edward J.;Juhl, Martin;Kagechika, Katsuji;Favor, David A.

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海洋神经毒素阿司匹酸-1的合成已完成。通过催化对映选择性反应合成单个片段:得到E环和HI环片段的杂Diels-Alder反应,提供CD环片段的羰基-烯反应,以及提供FG环片段的Mukaiyama Aldol反应。随后的片段偶联是通过羟醛和砜阴离子方法完成的。形成非非环目标的所有酮化事件都是在平衡条件下完成的,利用分子的嵌入构型采用一种有利的构象。最后将异构体EFGHI-砜阴离子偶联到ABCD-醛上,完成了(+)-阿司匹酸-1的聚合合成。
The synthesis of the marine neurotoxin azaspiracid-1 has been accomplished. The individual fragments were synthesized by catalytic enantioselective processes: A hetero-Diels-Alder reaction to afford the E- and HI-ring fragments, a carbonyl-ene reaction to furnish the CD-ring fragment, and a Mukaiyama aldol reaction to deliver the FG-ring fragment. The subsequent fragment couplings were accomplished by aldol and sulfone anion methodologies. All ketalization events to form the non-acyclic target were accomplished under equilibrating conditions utilizing the imbedded configurations of the molecule to adopt one favored conformation. A final fragment coupling of the anomeric EFGHI-sulfone anion to the ABCD-aldehyde completed the convergent synthesis of (+)-azaspiracid-1.
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发表时间: 2000-11-30
期刊: ORGANIC LETTERS
影响因子: 5.2
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