iron: A new PNN iron complex has been developed for use in an iron‐catalyzed alkenehydroboration reaction under mild conditions. The environmentally friendly and earth‐abundant iron catalyst system is superior to precious‐metal systems in terms of efficiency and selectivity for α‐olefin hydroborations with pinacolborane.
Cobalt-Catalyzed Enantioselective Hydroboration of 1,1-Disubstituted Aryl Alkenes
作者:Lei Zhang、Ziqing Zuo、Xiaolong Wan、Zheng Huang
DOI:10.1021/ja5093908
日期:2014.11.5
We report the synthesis of cobalt complexes of novel iminopyridine-oxazoline (IPO) ligands and their application to the asymmetric hydroboration of 1,1-disubstitutedarylalkenes. The new catalysts afforded α-alkyl-β-pinacolatoboranes with exclusive regioselectivity in high yields with up to 99.5% ee. Furthermore, we have applied this method to an efficient synthesis of naproxen.