Synthesis, structure and comparative stability of β-hydrazono, oximino methyl ether and imino boronates
作者:Richard J. Mears、Helen E. Sailes、John P. Watts、Andrew Whiting
DOI:10.1039/b004573j
日期:——
prepared by the sequential lithiation of the corresponding methyl hydrazone or oxime methyl ether, followed by reaction with an iodomethylboronate ester, typically in the form of the pinacol ester. The resulting products have contrasting hydrolytic stabilities. β-Hydrazono boronates are highly sensitive to intramolecularly catalysed hydrolysis, providing the corresponding β-keto boronates in generally high
β-羟基和肟基 醚 硼酸盐 通过依次将相应的甲基或肟甲基醚锂化,然后与通常以频哪醇形式的碘甲基硼酸酯反应来制备 酯。所得产物具有相反的水解稳定性。β-羟基硼酸盐 对分子内催化高度敏感 水解,提供相应的β-酮 硼酸盐普遍高产;β-肟基醚 硼酸盐 对...稳定 硅石 凝胶 色谱法并显示出E – Z-异构化的证据。稳定的手性硼酸酯 β-肟基衍生物 醚可以通过二乙醇胺介导的频哪醇通过双酯交换工艺轻松制备酯 交换,然后用同手性的二乙醇胺酯水解-再酯化过程 二醇。β-氨基硼酸盐可以通过相应的β-酮基硼酸酯与α-酮缩合原位生成伯胺,但是结果 亚胺 功能高度水解不稳定,不能以纯净形式分离。