Rhodium-Catalyzed <i>Endo</i>-Selective Epoxide-Opening Cascades: Formal Synthesis of (−)-Brevisin
作者:Kurt W. Armbrust、Matthew G. Beaver、Timothy F. Jamison
DOI:10.1021/jacs.5b03570
日期:2015.6.3
an effective catalyst for endo-selective cyclizations and cascades of epoxy-(E)-enoate alcohols, thus enabling the synthesis of oxepanes and oxepane-containing polyethers from di- and trisubstituted epoxides. Syntheses of the ABC and EF ring systems of (-)-brevisin via all endo-diepoxide-opening cascades using this method constitute a formal totalsynthesis and demonstrate the utility of this methodology
[Rh(CO)2Cl]2 是环氧-(E)-烯醇的内选择性环化和级联反应的有效催化剂,因此能够从二取代和三取代环氧化物合成氧杂环庚烷和含氧杂环己烷的聚醚。(-)-brevisin 的 ABC 和 EF 环系统使用这种方法通过所有内双环氧化物开放级联合成构成正式的全合成,并证明了这种方法在合成海洋阶梯聚醚天然产物的背景下的实用性。
Synthesis of the ABC Ring Fragment of Brevisin, a New Dinoflagellate Polycyclic Ether
作者:Kazuo Tachibana、Masayuki Satake、Naohito Ohtani、Ryosuke Tsutsumi、Takefumi Kuranaga、Tomohiro Shirai、Jeffrey L. C. Wright、Daniel G. Baden
DOI:10.3987/com-09-s(s)93
日期:——
A polycyclic ether, brevisin was isolated from the red-tide dinoflagellate Karenia brevis. Its unique skeletal structure consists of two separate tricyclic ether assemblies connected by a methylene bridge. The ABC ring fragment of brevisin was synthesized via Suzuki-Miyaura cross coupling toward a total synthesis of brevisin.
An improved synthesis of (−)-brevisamide, a marine monocyclic ether amide of dinoflagellate origin
作者:Ryosuke Tsutsumi、Takefumi Kuranaga、Jeffrey L.C. Wright、Daniel G. Baden、Emiko Ito、Masayuki Satake、Kazuo Tachibana
DOI:10.1016/j.tet.2010.06.074
日期:2010.8
An improved synthesis of (−)-brevisamide a marine cyclic ether isolated from the red-tide dinoflagellate Karenia brevis was achieved. The ether ring portion was constructed from an unsaturated lactone, which was prepared enantioselectively via an Evans aldol reaction and one-pot lactonization in the presence of excessive base after an Ando reaction. The ether ring and a dienol side chain fragment were