Simple Access to Elusive α-Boryl Carbanions and Their Alkylation: An Umpolung Construction for Organic Synthesis
作者:Kai Hong、Xun Liu、James P. Morken
DOI:10.1021/ja505455z
日期:2014.7.30
The reaction of 1,1-bis(pinacolboronate) esters with alkyl halides can be effected by metal alkoxides and provides a strategy for the construction of organoboronate compounds. The reaction is found to occur by alkoxide-induced deborylation and generation of a boron-stabilized carbanion.
Facile Access to Cyclopropylboronates via Stereospecific Deborylative Cyclization: A Leaving Group‐Assisted Activation of Geminal Diborons
作者:Xin-Yi Chen、Feng-Chen Gao、Peng-Fei Ning、Yi Wei、Kai Hong
DOI:10.1002/anie.202302638
日期:——
A transition metal-free deborylative cyclization strategy led to the efficient synthesis of racemic and enantioenriched cyclopropylboronates. The cyclization of geminal-bis(boronates) bearing a leaving group was highly diastereoselective and stereospecific, tolerating various functional groups and heterocycles. Mechanistic studies indicated that the leaving group at the γ-position significantly promoted