Radical-Hydroboration-Involved One-Pot Synthesis of Boron-Handled Glycol Derivatives
作者:Feng-Lian Zhang、Yi-Feng Wang、Bi-Yang Zhuang、Ji-Kang Jin
DOI:10.1055/s-0040-1707142
日期:2021.3
A one-pot two-step protocol for the direct synthesis of boron-handled glycol derivatives is reported. The procedure starts by an NHC–boryl-radical-promoted regioselective hydroboration of glycol-protected cinnamaldehydes. After that, the reaction mixture is treated with pinacol in the presence of HCl, leading to the direct formation of pinacol boronate handled glycol monoalkyl ethers. In this acid-triggered
Aldehydes were efficiently transformed into allylic dioxolanes by a Wittig-type reaction, using 1,3-dioxolan-2-yl-methyltriphenylphosphonium bromide under phase transfer conditions. The substituent kinetic effects were studied, and related to Hammett values and electrochemical potentials. (C) 1998 Elsevier Science Ltd. All rights reserved.