Transition Metal-Free trans-Selective Alkynylboration of Alkynes
摘要:
We report the first transition metal-free and trans-selective alkynylboration reaction of alkynes. This unprecedented carboboration reaction is enabled by pseudo-intramolecular activation of alkynylboronates using propargylic alcohols. The carboboration affords 4-alkynyl-1,2-oxaborol-2(5H)-ols, which are not only versatile building blocks but also exhibit strong violet blue fluorescence emission.
A silver/DBU catalyst system was developed for the effective synthesis of cyclic carbonate and oxazolidinone from the reaction of CO2 with propargylicalcohols and propargylic amines, respectively,...
The combined catalyst system of silver acetate with a chiral Schiff base ligand achieved asymmetric carbondioxideincorporation into bispropargylic alcohols with desymmetrization to afford the corresponding cyclic carbonates with good-to-excellent enantiomeric excesses.