Novel Polymer Effect in Cleavage Reactions of Acetals and Silyl Ethers in Aqueous Media Catalyzed by a Polymer-Supported Dicyanoketene Acetal
作者:Yukio Masaki、Tomoyasu Yamada、Nobuyuki Tanaka
DOI:10.1055/s-2001-16073
日期:——
Deprotecting reactions of acetals including acetonides, ethylene acetals, and THP ethers of alcohols, an aldehyde, and ketones, and silyl ethers of primary and secondary alcohols were investigated using dicyanoketene acetals (DCKA) and a polymer-supported DCKA as a π-acid promoter in aqueous acetonitrile and a single aqueous medium. In all reactions catalytic activity of the polymer-supported DCKA
使用双氰基乙烯酮缩醛 (DCKA) 和聚合物负载的 DCKA 作为 π 酸促进剂,研究了缩醛的脱保护反应,包括丙酮化物、乙烯缩醛和醇、醛和酮的 THP 醚以及伯醇和仲醇的甲硅烷基醚在乙腈水溶液和单一水性介质中。在所有反应中,发现聚合物负载的 DCKA 的催化活性远高于分子 DCKA,并观察到优异的聚合物效应。特别是在水中的脱缩醛反应中,聚合物负载的DCKA与分子DCKA的催化效率差异显着。