Ethynyl-1,2-benziodoxol-3(1 H)-one (EBX): An Exceptional Reagent for the Ethynylation of Keto, Cyano, and Nitro Esters
作者:Davinia Fernández González、Jonathan P. Brand、Jérôme Waser
DOI:10.1002/chem.201001539
日期:2010.8.16
Hot alkyne! The in situ generation of ethynyl‐1,2‐benziodoxol‐3(1H)‐one (EBX) from a silyl‐protected reagent by using TBAF is reported. EBX displayed exceptional acetylene transfer ability onto stabilizedenolates (see scheme), even at −78 °C. The mild reaction conditions allowed the first ethynylation reactions of linear keto, cyano, and nitro esters in high yields to give all‐carbon quaternary centers