PEG400-enhanced synthesis of gem-dichloroaziridines and gem-dichlorocyclopropanes via in situ generated dichlorocarbene
作者:Qing-Wen Song、Bing Yu、An-Hua Liu、Ying He、Zhen-Zhen Yang、Zhen-Feng Diao、Qing-Chuan Song、Xue-Dong Li、Liang-Nian He
DOI:10.1039/c3ra43307b
日期:——
efficient phase transfer catalyst for the cycloaddition reaction of imines with dichlorocarbene, which is generated in situ from chloroform and sodium hydroxide, to give gem-dichloroaziridines in moderate to excellent yields at ambient temperature. This protocol is also extended to the synthesis of cyclopropanes from a variety of alkenes. In this study, PEG400 behaves as a phase transferreagent thanks to
Novel Synthesis of <i>g</i><i>em</i>-Dichloroaziridines from Imines via the KF/Al<sub>2</sub>O<sub>3</sub>-Promoted Generation of Dichlorocarbene from Chloroform
KF/Al2O3 was found to be an efficient base for the reaction of imines with chloroform in acetonitrile to give gem-dichloroaziridines 2 in moderate to high yields. The KF/Al2O3-promoted dichloroaziridination can be carried out with simple workup, tolerates a variety of functional groups present in the imines, and proceeds smoothly with a smaller amount of carbene source.
发现KF / Al 2 O 3是亚胺与氯仿在乙腈中反应以中等至高收率得到宝石-二氯氮丙啶2的有效碱。可以通过简单的后处理进行KF / Al 2 O 3促进的二氯叠氮基化,耐受亚胺中存在的各种官能团,并使用较少量的卡宾源平稳地进行。