A Novel One-Pot Method for the Preparation of Pyrazoles by 1,3-Dipolar Cycloadditions of Diazo Compounds Generated in Situ
作者:Varinder K. Aggarwal、Javier de Vicente、Roger V. Bonnert
DOI:10.1021/jo0268409
日期:2003.6.1
procedure for the preparation of pyrazoles by 1,3-dipolar cycloaddition of diazo compounds generated in situ has been developed. Diazo compounds derived from aldehydes were reacted with terminal alkynes to furnish regioselectively 3,5-disubstituted pyrazoles. Furthermore, the reaction of N-vinylimidazole and diazo compounds derived from aldehydes gave exclusively 3-substituted pyrazoles in a one-pot process
已经开发了一种方便的一锅法,该方法通过现场产生的重氮化合物的1,3-偶极环加成制备吡唑。使衍生自醛的重氮化合物与末端炔烃反应,以区域选择性地提供3,5-二取代的吡唑。此外,N-乙烯基咪唑和衍生自醛的重氮化合物的反应在一锅法中仅生成3-取代的吡唑。