Diaziridine ring expansion in 6-aryl-1,5-diazabicyclo[3.1.0]hexanes upon reactions with activated olefins in ionic liquids
作者:Yu. S. Syroeshkina、L. L. Fershtat、V. V. Kachala、V. V. Kuznetsov、N. N. Makhova
DOI:10.1007/s11172-010-0286-x
日期:2010.8
Reactions of 1,3-diphenylpropen-2-one and α-nitrostyrenes with azomethine imines, generated from 6-aryl-1,5-diazabicyclo[3.1.0]hexanes on catalysis with Et2O•BF3 in ionic liquids, were found to proceed with high regio- and stereoselectivity to afford the products of the diaziridine ring expansion, viz., [3-aryl-2-phenyltetrahydro-1H,5H-pyrazolo[1,2-a]pyrazol- 1-yl](phenyl)methanones, 1,3-diaryl-2-nitrotetrahydro-1H,5H-pyrazolo[1,2-a]pyrazoles and 5-aryl-6-(3-nitrophenyl)-2,3-dihydro-1H-pyrazolo[1,2-a]pyrazolium tetrafluoroborates (hexafluorophosphates). The reactions discovered are new, more simple methods for the syn- thesis of bicyclic structures.
在离子液体中用 Et2O-BF3 催化由 6-芳基-1,5-二氮杂双环[3.1.0]己烷生成的 1,3-二苯基丙烯-2-酮和α-硝基苯甲炔与偶氮亚胺的反应被发现具有很高的区域和立体选择性,可得到二氮丙啶扩环产物,即[3-芳基-2-苯基四氢-1H,5H-吡唑并[1,2-a]吡唑-1-基](苯基)甲酮、1,3-二芳基-2-硝基四氢-1H,5H-吡唑并[1,2-a]吡唑和 5-芳基-6-(3-硝基苯基)-2,3-二氢-1H-吡唑并[1,2-a]吡唑鎓四氟硼酸盐(六氟磷酸盐)。所发现的反应是合成双环结构的更简单的新方法。