One-Pot, Two-Step Conversion of Aldehydes to Phosphonyl- and Sulfonylpyrazoles Using Bestmann–Ohira Reagent
作者:Rahul Kumar、Deepti Verma、Shaikh M. Mobin、Irishi N. N. Namboothiri
DOI:10.1021/ol301695e
日期:2012.8.17
A one-pot, two-step, three-component method for the conversion of commercially available aldehydes to phosphonylpyrazoles has been developed, demonstrating, for the first time, the dual reactivity of the Bestmann–Ohira reagent (BOR) in a single-pot transformation. This method, extended to the synthesis of sulfonylpyrazoles by employing BOR in the first step and a diazomethyl sulfone in the second step
已经开发出了一种一锅,两步,三组分方法,可将市售醛转化为磷酸nylpyryrazoles,这首次证明了Bestmann–Ohira试剂(BOR)在单锅中的双重反应性转型。在区域选择性方面,该方法扩展到通过在第一步中使用BOR而在第二步中使用重氮甲基砜合成磺酰吡唑,与先前用于合成这种官能化吡唑的方法互补。