作者:Raffaele Pasceri、Hannah E. Bartrum、Christopher J. Hayes、Christopher J. Moody
DOI:10.1039/c2cc37284c
日期:——
Treating readily available α-diazo-β-ketoesters with HBF4 results in nucleophilic fluorination by the usually inert and stable tetrafluoroborate anion. The resulting α-fluoro-β-ketoesters are highly versatile synthetic intermediates, for example in the preparation of fluoro-heterocycles, as illustrated by the direct formation of fluoro-pyrimidines, -pyrazoles and -coumarins in a single step.
将易得的α-重氮-β-酮酯用HBF4处理,会导致通常惰性且稳定的四氟硼酸根阴离子发生亲核氟化反应。由此产生的α-氟-β-酮酯是非常多才多艺的合成中间体,例如在制备氟杂环化合物中,如通过一步反应直接形成氟代嘧啶、吡唑和香豆素所示。