Total Synthesis and Biological Evaluation of (−)-9-Deoxy-englerin A
摘要:
An effective total synthesis of (-)-9-deoxy-englerin (4), an analogue of the natural guaiane sesquiterpene englerin A (1), has been achieved. The synthesis features a transannular epoxide opening to construct the 5,7-fused ring system followed by transannular ether formation with mercury(II) trifluoroacetate.
A concise enantioselective synthesis of the guaiane sesquiterpene (−)-oxyphyllol
作者:Martin Zahel、Peter Metz
DOI:10.3762/bjoc.9.239
日期:——
(-)-Oxyphyllol was prepared in only 4 steps from an epoxy enone that already served as an intermediate for the total synthesis of the anticancer guaiane (-)-englerin A. A regio- and diastereoselective Co(II)-catalyzed hydration of the olefin and a transannular epoxide opening were used as the key reactions.
(-)-Oxyphyllol 仅通过 4 个步骤从环氧烯酮制备,该环氧烯酮已经作为抗癌愈创木酚 (-)-englerin A 全合成的中间体。区域和非对映选择性 Co(II)-催化水合烯烃和环氧化物开环被用作关键反应。
Syntheses of Epoxyguaiane Sesquiterpenes (−)-Englerin A, (−)-Oxyphyllol, (+)-Orientalol E, and (+)-Orientalol F: A Synthetic Biology Approach
A combined approach toward syntheses of epoxyguaiane sesquiterpenes is presented. By use of a fungus sesquiterpene cyclase, guaian-6,10(14)-diene was produced through metabolic engineering of the isoprenoid pathway in E. coli. (-)-Englerin A, (-)-oxyphyllol, (+)-orientatol E, and (+)-orientalol F have been synthesized in two to six steps. This strategy provided rapid access to the epoxyguaiane core
Herein, we report the semisynthetic production of the potent transient receptor potential canonical (TRPC) channel agonist englerin A (EA), using guaia 6,10(14)-diene as the starting ma-terial. Guaia-6,10(14)-diene was systematically engineered in Escherichia coli and Saccharomyces cerevisiae using the CRISPR/Cas9 system and produced with high titers. This opened the possibility for a very short semisynthesis
在此,我们报告了使用愈创木 6,10(14)-二烯作为起始材料的强效瞬时受体电位规范 (TRPC) 通道激动剂 englerin A (EA) 的半合成生产。Guaia-6,10(14)-二烯使用 CRISPR/Cas9 系统在大肠杆菌和酿酒酵母中系统工程化,并以高滴度生产。这为 EA 和两种相关愈创木酚和东方香酚 E 的非常短的半合成开辟了可能性。潜在的可扩展方法结合了合成生物学和化学合成的优势,并提供了一种生产 EA 及其类似物的有效且经济的方法。