Acid-Catalyzed Transacetalization from Glycol to Pinacol Acetals
作者:Yvonne Seeleib、Gregor Nemecek、Dominik Pfaff、Bastian D. Süveges、Joachim Podlech
DOI:10.1080/00397911.2014.912330
日期:2014.10.18
transacetalization of glycolacetals, frequently used as protecting groups of the aldehyde function, into the more stable pinacol acetals is given. A clean transformation of aromatic and aliphatic substrates is possible with trifluoroacetic acid within 30 min at 0 °C. Glycolacetals derived from ketones (ketals) cannot be converted with this protocol. Deprotection of the pinacol acetals is possible with
摘要 给出了通常用作醛官能团保护基团的乙二醇缩醛的一锅转缩醛转化为更稳定的频哪醇缩醛。在 0 °C 下,使用三氟乙酸可在 30 分钟内实现芳香族和脂肪族底物的彻底转化。从酮(缩酮)衍生的乙二醇缩醛不能用此协议转换。频哪醇缩醛的脱保护可以在水存在下用三氟甲磺酸进行。图形概要