An Efficient Synthesis of Terminal Allenes from Terminal 1-Alkynes
作者:Jinqiang Kuang、Shengming Ma
DOI:10.1021/jo802391x
日期:2009.2.20
We have developed a modified method for the synthesis of terminalallenesfromterminal 1-alkyne: The reaction of 1-alkynes with 1.8 equiv of Cy2NH and 2.5 equiv of paraformaldehyde mediated by CuI (0.5 equiv) in refluxing dioxane may produce terminalallenes in much higher yields than the previously reported protocol and many functional groups such as mesylate, hydroxyl group, ether, amide, etc. may