A method of preparing an α-cyanoacrylate ester of a desired alcohol includes the steps of
preparing a compound which is an α-selenoaryl-α-cyanopropionate ester of the desired alcohol,
oxidizing said α-selenoaryl-α-cyanopropionate ester to the corresponding selenoxide,
eliminating arylselenic acid from the selenoxide to produce said α-cyanoacrylate ester, and
separating said α-cyanoacrylate ester from the selenic acid.
At temperatures of about 0°C or higher, the elimination step occurs concurrently with the oxidizing step using a peroxide or ozone oxidizing agent. The desired cyanoacrylate ester is obtained in good yield and very high purity. The method can be used to prepare difficult to synthesize plural functional cyanoacrylate monomers and mono-cyanoacrylate monomers regardless of alcohol chain length.
一种制备所需
醇类的 α-
氰基丙烯酸酯的方法包括以下步骤
制备所需醇的α-
硒酰基-α-
氰基
丙酸酯的化合物、
将所述 α-
硒芳基-α-
氰基
丙酸酯氧化成相应的
硒氧化物、
从
硒氧化物中消除芳基
硒酸,生成所述 α-
氰基丙烯酸酯,以及
将所述α-
氰基丙烯酸酯与
硒酸分离。
在约 0°C 或更高的温度下,消除步骤与使用过氧化物或
臭氧氧化剂的氧化步骤同时进行。所需的
氰基丙烯酸酯产量高、纯度高。该方法可用于制备难以合成的多元官能团
氰基丙烯酸酯单体和单
氰基丙烯酸酯单体,而与醇链长度无关。