作者:Shabber Mohammed、Ram A. Vishwakarma、Sandip B. Bharate
DOI:10.1039/c4ra14694h
日期:——
8-diazabicyclo[5.4.0]undec-7-ene (DBU) promoted regioselective synthesis of 3,5-disubstituted isoxazoles and isoxazolines from aldoximes has been described. This method allows the reaction to proceed efficiently on aldoximes containing unprotected phenolic hydroxyl groups. Furthermore, with the use of higher equivalents of N-chlorosuccinimide, chloro-substituted isoxazoles and isoxazolines were obtained as the
已经描述了一种新的简单有效的无金属的1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)促进的由醛肟合成的3,5-二取代的异恶唑和异恶唑啉的区域选择性合成。该方法允许反应在含有未保护的酚羟基的醛肟上有效地进行。此外,通过使用较高当量的N-氯代琥珀酰亚胺,通过串联一锅的1,3-偶极环加成,然后进行区域选择性氯化,获得了氯取代的异恶唑和异恶唑啉作为唯一产物。