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
Synthesis of Enantioenriched Tertiary Boronic Esters from Secondary Allylic Carbamates. Application to the Synthesis of C30 Botryococcene
作者:Alexander P. Pulis、Varinder K. Aggarwal
DOI:10.1021/ja303022d
日期:2012.5.2
reaction has been explored and found to embrace a broad range of both allylic carbamates and boronic esters. The methodology has been applied to an eight-step, stereoselective synthesis of each of the diastereoisomers of C30 botryococcene.
对映体富集的仲烯丙基氨基甲酸酯已被 sBuLi 去质子化并与硼酸酯反应。与其他亲电试剂相比,观察到了高α-选择性,并且硼酸盐络合物的形成几乎完全保留了立体化学。硼酸酯复合物经历了立体有择的 1,2-迁移,产生了具有更高 er (>98:2) 的叔烯丙基硼酸酯。该反应的范围已被探索并发现包括广泛的烯丙基氨基甲酸酯和硼酸酯。该方法已应用于 C30 葡萄球菌烯的每种非对映异构体的八步立体选择性合成。
Correction to Synthesis of Enantioenriched Tertiary Boronic Esters from Secondary Allylic Carbamates. Application to the Synthesis of C30 Botryococcene