Remarkable Solvent Effect on Pd(0)-Catalyzed Deprotection of Allyl Ethers Using Barbituric Acid Derivatives: Application to Selective and Successive Removal of Allyl, Methallyl, and Prenyl Ethers
作者:Hirokazu Tsukamoto、Takamichi Suzuki、Yoshinori Kondo
DOI:10.1055/s-2007-992352
日期:——
Pd(0)-catalyzed deprotection of allyl ethers using barbituric acid derivatives in protic polar solvent such as MeOH and aqueous 1,4-dioxane proceeds at room temperature without affecting a wide variety of functional groups. Control of the reaction temperature allows selective and successive cleavage of allyl, methallyl, and prenyl ethers. A study of ligand effects on the deprotection reveals that the
使用巴比妥酸衍生物在质子极性溶剂(如 MeOH 和 1,4-二恶烷水溶液中)中 Pd(0) 催化的烯丙基醚脱保护在室温下进行,而不会影响多种官能团。反应温度的控制允许烯丙基、甲代烯丙基和异戊二烯醚的选择性和连续裂解。配体对脱保护作用的研究表明,甲醇中反应性的提高是由于加速氧化加成到 Pd(0)。