A method for performing an iron-catalyzed allylic alkylation includes the preparation of a reaction mixture obtainable from (i) an allylic substrate with the structural element C═C—C—X, wherein X comprises a leaving group that represents a carbonate, (ii) an active Fe(-II) catalyst complex, (iii) at least one ligand, (iv) at least one solvent, and (v) a nucleophile or pronucleophile.
Stereoselective synthesis of the C14 C23 fragment of biselyngbyolide A and B enabled by transition metal catalysis
作者:Rakesh G. Thorat、Bailey A. Brooks、Brandon Nichols、Andrew M. Harned
DOI:10.1016/j.tet.2018.10.066
日期:2018.12
Transition met al catalysis has enabled the highly stereoselective and protecting group-free synthesis of the C14-C23 fragment of the apoptosis-inducing natural products biselyngbyolide A and B. A Pd-catalyzed Stille reaction between a vinyl stannane and a crotyl carbonate formed the skipped diene with complete control of the the trisubstituted bond and excellent control over the branched/linear products
过渡金属催化能够高度立体选择性且无保护基地合成诱导细胞凋亡的天然产物 biselngbyolide A 和 B 的 C14-C23 片段。乙烯基锡烷和巴豆基碳酸酯之间的 Pd 催化 Stille 反应形成了跳跃的二烯对三取代键的完全控制和对支化/直链产物的出色控制。使用铜催化的斯塔尔氧化来形成银催化的不对称烯丙基化所需的醛。后者为最终片段提供了出色的立体化学控制。