描述了真菌代谢物 (-)-stephacidin A、(+)-stephacidin B 和 (+)-notoamide B 的简洁不对称全合成。这些全合成的关键特征包括(1)(R)-烯丙基脯氨酸甲酯的简便合成,(2)吡喃吲哚环系统的修正路线,(3)引入重要功能的新型交叉复分解策略基团,和(4)SN2'环化形成[2.2.2]桥连双环系统。此外,我们的合成利用微波加热来缩短反应时间并提高重要中间体制备的产率。
Concise syntheses of the 1,7-dihydropyrano[2,3-g]indole ring system of the stephacidins, aspergamides and norgeamides
作者:Alan W. Grubbs、Gerald D. Artman、Robert M. Williams
DOI:10.1016/j.tetlet.2005.10.112
日期:2005.12
towards the synthesis of the 1,7-dihydropyrano[2,3-g]indole ring system of the stephacidins, paraherquamides and norgeamides have been investigated. The first involves a tandem nitrene insertion/aromatic Claisen rearrangement. The second consists of a more conventional approach from commercially available 6-benzyloxyindole. The third approach is a revised synthesis of the 2-prenylated pyrano indole necessary
已经研究了三种合成Stephacidins,对乙酰氨基甲酰胺和降冰酰胺的1,7-二氢吡喃并[2,3- g ]吲哚环系统的方法。第一个涉及串联的氮烯插入/芳族克莱森重排。第二种是由可商购的6-苄氧基吲哚得到的更常规的方法。第三种方法是对仿生的狄尔斯-阿尔德方法进行仿生的狄斯卡德-阿德耳方法的合成合成,其中所述方法是对步冬青素,天冬酰胺和降冰片酰胺的仿生。
Enantioselective Construction of Spirocyclic Oxindolic Cyclopentanes by Palladium-Catalyzed Trimethylenemethane-[3+2]-Cycloaddition
作者:Barry M. Trost、Nicolai Cramer、Steven M. Silverman
DOI:10.1021/ja075335w
日期:2007.10.1
The palladium catalyzed [3+2] trimethylenemethane (TMM) cycloaddition is an efficient method for the construction of cyclopentanes. Herein, we report a catalytic asymmetric protocol for the synthesis of spirocyclic oxindolic cyclopentanes in excellent yields and enantioselectivities, allowing for the first time the construction of up to three adjacent stereogenic centers. In this process, the chiral