作者:Dmitriy M. Volochnyuk、Alexei O. Pushechnikov、Dmitriy G. Krotko、Alexandr M. Pinchuk、Andrei A. Tolmachev
DOI:10.1055/s-2005-916029
日期:——
N,N′-Diarylureas having electron-donating substituents at appropriate positions react with phosphorus(III) bromide forming the new heterocyclic system 2,4,1-benzodiazaphosphinan-3-one. N-(5-Pyrazolyl), N′-arylureas, and N,O-diarylcarbamates also undergo an analogous heterocyclization affording 1H-pyrazolo[4,3-c][1,5,2]diazaphosphinan-3-one and 2,4,1-benzoxazaphosphinan-3-one ring systems.
在适当位置具有电子捐赠取代基的 N,N′-芳基脲与溴化磷(III)发生反应,形成新的杂环系统 2,4,1-苯并二氮杂环膦-3-酮。N-(5-吡唑基)、N′-芳脲类和 N,O-二芳基氨基甲酸酯也会发生类似的杂环化反应,生成 1H-吡唑并[4,3-c][1,5,2]二氮杂萘-3-酮和 2,4,1-苯并噁唑膦-3-酮环系统。