organofluorine compounds. Although the preparation of several β-fluoroalkyl-acrylates is known, a general and straightforward lab-scale methodology for the preparation of multigram amounts of these compounds from fluoroacetic esters is not available, and the related chemistry has not been investigated in detail. We now describe an optimized three-step protocol relying on: (1) Claisen-type condensation of fluoroacetic
β-氟烷基丙烯酸酯是有机氟化合物合成的重要组成部分。尽管已知几种β-氟代烷基丙烯酸酯的制备方法,但尚无用于从氟代乙酸酯制备数克这些化合物的通用且直接的实验室规模方法,并且尚未对相关化学方法进行详细研究。现在,我们基于以下内容描述一种优化的三步协议:(1)使用LDA作为碱,将氟乙酸酯与乙酸乙酯进行Claisen型缩合;(2)以甲苯或苯为溶剂,用NaBH 4还原所得的γ-氟-β-酮酯。(3)P 2 O 5促进中间体γ-氟-β-羟基酯的脱水。该方法可提供仅包含氟原子(CF 3,CHF 2,C 2 F 5)的目标化合物的制备有用的产率,而无法以分析纯的形式获得γ-卤代二氟甲基(CClF 2,CBrF 2,CIF 2)丙烯酸酯从脱水步骤中形成。
KITATSUMEH, TOMOYA;ITO, KEJDZO
作者:KITATSUMEH, TOMOYA、ITO, KEJDZO
DOI:——
日期:——
KITAZUME, TOMOYA;OHNOGI, TAKESHI;LIN, JENQ TAIN;YAMAZAKI, TAKASHI, J. FLUOR. CHEM., 42,(1989) N, C. 17-19