Mild and Chemoselective Synthesis and Deprotection of Geminal Diacetates Catalyzed by Titanium(IV) Halides
作者:Jae-Sang Ryu、Misuk Jung、Jieun Yoon、Hak Kim
DOI:10.1055/s-0029-1218849
日期:2010.8
A novel, mild, and chemoselective method was developed for the preparation of gem-diacetates from aldehydes and acetic anhydride in the presence of titanium(IV) fluoride (1-5 mol%) under solvent-free conditions at room temperature. The reaction showed a high chemoselectivity toward aldehydes in the presence of ketones. Moreover, titanium(IV) fluoride also catalyzed the deprotection of gem-diacetates
开发了一种新颖,温和且化学选择性的方法,该方法用于在无溶剂条件下,室温下在氟化钛(IV)(1-5 mol%)的存在下,从醛和乙酸酐中制备宝石二乙酸酯。在酮存在下,反应显示出对醛的高化学选择性。而且,氟化钛(IV)也催化了宝石-二乙酸酯在水中的脱保护为相应的醛。这种有效而简单的方法具有许多优点,包括使用廉价的催化剂,无溶剂条件,温和的反应温度和高收率,这使其既具有成本效益又对环境友好。 醛-保护基-化学选择性-脱保护-酰化