Enantioselective Synthesis of (+)-Malbrancheamide B
摘要:
The asymmetric total synthesis of the chlorinated [2.2.2]-diazabicyclic indole alkaloid (+)-malbrancheamide B is reported. Key to the synthesis is a domino reaction sequence that employs an aldol condensation, alkene isomerization, and intramolecular Diels-Alder cycloaddition. Diastereofacial selection between the azadiene stereofaces is enforced with a chiral aminal auxiliary. A formal 7-step (longest linear route) synthesis of (+/-)-malbrancheamide B is also reported.
Bioinspired chemical synthesis of monomeric and dimeric stephacidin A congeners
作者:Ken Mukai、Danilo Pereira de Sant'Ana、Yasuo Hirooka、Eduardo V. Mercado-Marin、David E. Stephens、Kevin G. M. Kou、Sven C. Richter、Naomi Kelley、Richmond Sarpong
DOI:10.1038/nchem.2862
日期:2018.1
biosynthesis. We identify a short total synthesis of congeners in the reverse-prenylated indole alkaloid family related to stephacidin A by taking advantage of a direct indole C6 halogenation of the related ketopremalbrancheamide. This novel strategic approach has now made possible the syntheses of severalnaturalproducts, including malbrancheamides B and C, notoamides F, I and R, aspergamide B, and waikialoid
Biomimetic Total Synthesis of Malbrancheamide and Malbrancheamide B
作者:Kenneth A. Miller、Timothy R. Welch、Thomas J. Greshock、Yousong Ding、David H. Sherman、Robert M. Williams
DOI:10.1021/jo800116y
日期:2008.4.1
The biomimetic total syntheses of both malbrancheamide and malbrancheamide B are reported. The synthesis of the two monochloro species enabled the structure of malbrancheamide B to be unambiguously assigned. The syntheses each feature an intramolecular Diels−Alder reaction of a 5-hydroxypyrazin-2(1H)-one to construct the bicyclo[2.2.2]diazaoctane core, which has also been proposed as the biosynthetic
报道了 malbrancheamide 和 malbrancheamide B 的仿生全合成。两种一氯物质的合成使得 Malbrancheamide B 的结构能够被明确指定。这些合成均以 5-羟基吡嗪-2(1 H )-one 的分子内 Diels-Alder 反应为特征,以构建双环[2.2.2]二氮杂辛烷核心,这也被提议作为这些化合物的生物合成途径。
HALOGENATION OF COMPLEX ORGANIC COMPOUNDS
申请人:THE REGENTS OF THE UNIVERSITY OF MICHIGAN
公开号:US20200048617A1
公开(公告)日:2020-02-13
The disclosure provides biocatalysts that halogenate complex chemical compounds in specific and predictable ways. Also disclosed are halogenated complex organic compounds. The disclosure further provides methods for the halogenation of complex chemical compounds and methods of inhibiting the contraction of smooth muscle in mammals.
Calmodulin inhibitory activity of the malbrancheamides and various analogs
作者:Kenneth A. Miller、Mario Figueroa、Meriah W.N. Valente、Thomas J. Greshock、Rachel Mata、Robert M. Williams
DOI:10.1016/j.bmcl.2008.10.057
日期:2008.12
The preparation and biological activity of various structural analogs of the malbrancheamides are disclosed. The impact of indole chlorination, C-12a relative stereochemistry, and bicyclo[2.2.2]diazaoctane core oxidation state on the ability of these analogs to inhibit calmodulin dependent phosphodiesterase (PDE1) was studied, and a number of potent compounds were identified.[GRAPHICS](C) 2008 Elsevier Ltd. All rights reserved.