Unified Total Synthesis of Madangamine Alkaloids

被引:12
|
作者
Suto, Takahiro [1 ]
Yanagita, Yuta [1 ]
Nagashima, Yoshiyuki [1 ]
Takikawa, Shinsaku [1 ]
Kurosu, Yasuhiro [1 ]
Matsuo, Naoya [1 ]
Miura, Kazuki [1 ]
Simizu, Siro [1 ]
Sato, Takaaki [1 ]
Chida, Noritaka [1 ]
机构
[1] Keio Univ, Fac Sci & Technol, Dept Appl Chem, Kohoku Ku, 3-14-1 Hiyoshi, Yokohama, Kanagawa 2238522, Japan
关键词
Madangamine; Skipped diene; Total synthesis; PD-CATALYZED CYCLOISOMERIZATION; 1ST ENANTIOSELECTIVE SYNTHESIS; STEREOSELECTIVE-SYNTHESIS; DIAZATRICYCLIC CORE; SKIPPED DIENES; STEREOSPECIFIC SYNTHESIS; SUBSTITUTED 1,4-DIENES; ALLYLIC CARBONATES; UNSATURATED ESTERS; MARINE ALKALOIDS;
D O I
10.1246/bcsj.20180334
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The full details of a unified total synthesis of madangamine alkaloids are disclosed. Our central strategy is based on the construction of a common ABCE-tetracyclic system, followed by the late-stage installation of various D-rings. The common intermediate is assembled through N-acyliminium cyclization of a propargylsilane, and formation of the (Z,Z)-skipped diene. Stereoselective synthesis of the (Z,Z)-skipped diene is especially challenging, and is accomplished by the combination of Z-selective hydroboration of the 1,1-disubstituted allene and subsequent Migita-Kosugi-Stille coupling. Macrocyclic alkylation enables the late-stage variation of the D-rings on the common tetracyclic intermediate, resulting in the collective total syntheses of madangamines A-E. The synthetic madangamine alkaloids exhibited inhibitory activities against a variety of human cancer cell lines.
引用
收藏
页码:545 / 571
页数:27
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