A straightforward synthesis of ecteinascidin743 was accomplished from readily available l-glutamic acid as a single chiral source. Our novel synthesis features a concise and convergent approach for construction of the B-ring, consisting of a sequence involving a stereoselective Heck reaction between a diazonium salt and an enamide, oxidative cleavage of the resulting alkene, and intramolecular ortho
海鞘素 743 的直接合成是从容易获得的 l-谷氨酸作为单一手性来源完成的。我们的新合成具有构建 B 环的简洁和收敛的方法,包括一个序列,涉及重氮盐和烯酰胺之间的立体选择性 Heck 反应、所得烯烃的氧化裂解以及苯酚的分子内邻位取代醛。
Synthetic Studies on (+)-Naphthyridinomycin: Stereoselective Synthesis of the Tetracyclic Core Framework
[reaction: see text] The stereoselectivesynthesis of the tetracyclic intermediate 21 for (+)-naphthyridinomycin (1) has been accomplished. The convergent synthesis used the Ugi 4CC reaction with the amine derivative 10. The key features of the stereoselectivesynthesis of 21 were the intramolecular Mizoroki-Heck reaction, an aromatic-aldehyde cyclization, and a stereoselective hydroboration.
The present invention provides a preparation method for a natural product Trabectedin. Specifically, the present invention provides a preparation method for Et-743. In the method, tyrosine is used as an initial substrate, and after 26 steps of reaction, the Et-743 is synthesized. Raw materials and agents used in the synthetic route can all easily be obtained, reaction conditions are relatively mild, and preparation in large scale can be implemented.
Method For Total Synthesis Of Ecteinascidins And Intermediate Compounds Thereof
申请人:FUKUYAMA Tohru
公开号:US20090036673A1
公开(公告)日:2009-02-05
An intermediate compound for total synthesis of ecteinascidins comprising, a compound represented by general formula 2 having thioether group at C4 site, and the substituent R
2
of N
12
site is trichloroethoxicarbonyl (Troc) to which various substituents can be introduced by mild condition, further having 10 members ring structure which can be converted to a ring of other numbered members.
PREPARATION FOR NATURAL PRODUCT TRABECTEDIN
申请人:CE Pharm Co., Ltd.
公开号:US20210163500A1
公开(公告)日:2021-06-03
The present invention provides a preparation method for a natural product Trabectedin. Specifically, the present invention provides a preparation method for Et-743. In the method, tyrosine is used as an initial substrate, and after 26 steps of reaction, the Et-743 is synthesized. Raw materials and agents used in the synthetic route can all easily be obtained, reaction conditions are relatively mild, and preparation in large scale can be implemented.