Regio‐ and Stereoselective Homologation of 1,2‐Bis(Boronic Esters): Stereocontrolled Synthesis of 1,3‐Diols and Sch 725674
作者:Alexander Fawcett、Dominik Nitsch、Muhammad Ali、Joseph M. Bateman、Eddie L. Myers、Varinder K. Aggarwal
DOI:10.1002/anie.201608406
日期:2016.11.14
1,2-Bis(boronic esters), derived from the enantioselective diboration of terminal alkenes, can be selectively homologated at the primary boronic ester by using enantioenriched primary/secondary lithiated carbamates or benzoates to give 1,3-bis(boronic esters), which can be subsequently oxidized to the corresponding secondary-secondary and secondary-tertiary 1,3-diols with full stereocontrol. The transformation
1,2-双(硼酸酯)衍生自末端烯烃的对映选择性二硼化,可以通过使用对映体富集的伯/仲锂化氨基甲酸酯或苯甲酸酯在伯硼酸酯上选择性同系化,得到1,3-双(硼酸酯),随后可以完全立体控制地氧化成相应的仲-仲和仲-叔1,3-二醇。该转化应用于 14 元大环内酯 Sch 725674 的简明全合成。九步合成路线还具有二乙烯基甲醇衍生物的新型去对称对映选择性二硼化反应以及高产后期交叉复分解和 Yamaguchi 大环内酯化的特点反应。