A facile and efficient ultrasound-assisted stereospecific synthesis of novel bicyclo-cyclopropanes
作者:Naoufel Ben hamadi、Moncef Msaddek
DOI:10.1016/j.crci.2012.02.004
日期:2012.5
Résumé The regispecific synthesis of pyrazolines has been accomplished through the 1,3-dipolar cycloaddition of 2-diazopropane to pyridazine-3,6-dione derivatives. A convenient and inexpensive ultrasound-assisted preparation of bicyclo-cyclopropanes in a completely stereoselective manner in almost quantitative yields has been realized. The highly stereoselective extrusion of nitrogen suggests a concerted mechanism.
摘要 通过 2-二氮丙烷与哒嗪-3,6-二酮衍生物的 1,3-二极环加成,完成了吡唑类化合物的特异性合成。在超声波辅助下,以完全立体选择性的方式制备双环丙烷的方法既方便又廉价,而且几乎可以达到定量收率。氮的高度立体选择性挤出表明这是一种协同机制。