作者:Mingji Dai、Isaac J. Krauss、Samuel J. Danishefsky
DOI:10.1021/jo8016814
日期:2008.12.19
nucleophilic methylation. An RCMreaction to produce a tetrasubstituted double bond in the presence of free allylic alcohol and homoallylic oxygenated functional group is also described. This route shortened the synthesis of 11 from 9 steps to 3 steps. We have further developed a strategy to gain access to optically active spirotenuipesines A and B through the synthesis of enantioenriched 10 from commercially
Spirotenuipesines A 和 B 是由 Oshima 和同事从昆虫病原真菌 Paecilomyces tenuipes 中分离出来的。该合成的特点是通过分子内环丙烷化/自由基引发的断裂序列以及 α-亚甲基内酯亲双烯体 20 和协同二烯6a。C(9) 叔醇的安装通过亲核甲基化发生。还描述了在游离烯丙醇和高烯丙基含氧官能团存在下产生四取代双键的RCM反应。该路线将11种化合物的合成从9步缩短至3步。我们进一步开发了一种策略,通过从市售的 R-(-)-环氧氯丙烷合成对映体富集的 10 来获得光学活性的螺环肽 A 和 B。
Diverse synthesis of the C ring fragment of bryostatins via Zn/Cu-promoted conjugate addition of α-hydroxy iodide with enone
作者:Zhiwen Chu、Ruiqi Tong、Yufan Yang、Xuanyi Song、Tian bao Hu、Yu Fan、Chen Zhao、Lu Gao、Zhenlei Song
DOI:10.1016/j.cclet.2020.11.039
日期:2021.1
precursors for constructing the C ring of bryostatins, has been developed via a Zn/Cu-promoted conjugate addition of α-hydroxy iodides with enones. The reaction leads to direct formation of the C21-C22 bond and tolerates diverse functionalities at the C17-, C18- and C24-positions. The approach also enables a more concise synthesis of the known C ring intermediate (10 longest linear steps and 14 total
Stereocontrolled Radical Bicyclizations of Oxygenated Precursors Enable Short Syntheses of Oxidized Abietane Diterpenoids
作者:Darius Vrubliauskas、Benjamin M. Gross、Christopher D. Vanderwal
DOI:10.1021/jacs.0c13300
日期:2021.2.24
in these complexity-generating transformations. Specifically, we show the effects of protected or unprotected hydroxy groups at six different positions and their impact on stereoselectivity. Further, we show how multiply oxidized substrates perform in these reactions, and finally, we document the utility of these reactions in the synthesis of three aromatic abietane diterpenoids.