Scope and Limitations of Lithium-Ethylenediamine-THF-Mediated Cleavage at the α-Position of Aromatics: Deprotection of Aryl Methyl Ethers and Benzyl Ethers under Mild Conditions
作者:Takeshi Sugai、Takeyuki Shindo、Yasuaki Fukuyama
DOI:10.1055/s-2004-815977
日期:——
and limitation of lithium-ethylenediamine-THF-mediated reductive bond cleavage at the α-position of aromatics were examined. Very mild conditions such as lithium metal (5 equiv) and ethylenediamine (7 equiv) in oxygen-free THF were quite effective for the demethylation of aromaticethers even at as low as -10 °C. Allyl benzyl ethers were also deprotected under these conditions with very little change