Four new coumarins named qianhucoumarins A, B, C, D have been isolated from traditional Chinese medicine-the root of Peucedanum praeruptorum. Their structures were elucidated by chemical evidences and spectral analysis.
Twenty-seven oxadiazolino[5,4-d][1,5]benzodiheteropine derivatives have been synthesized by the 1,3-dipolar cycloaddition of benzodiheteropines with nitrile oxide 1,3-dipoles,their conformations and the characteristic...Twenty-seven oxadiazolino[5,4-d][1,5]benzodiheteropine derivatives have been synthesized by the 1,3-dipolar cycloaddition of benzodiheteropines with nitrile oxide 1,3-dipoles,their conformations and the characteristics of the newly formed oxadiazoline fused on them have been studied.It has also been found that the mass spectra show characteristic fragmentation patterns.展开更多
文摘Four new coumarins named qianhucoumarins A, B, C, D have been isolated from traditional Chinese medicine-the root of Peucedanum praeruptorum. Their structures were elucidated by chemical evidences and spectral analysis.
文摘Twenty-seven oxadiazolino[5,4-d][1,5]benzodiheteropine derivatives have been synthesized by the 1,3-dipolar cycloaddition of benzodiheteropines with nitrile oxide 1,3-dipoles,their conformations and the characteristics of the newly formed oxadiazoline fused on them have been studied.It has also been found that the mass spectra show characteristic fragmentation patterns.
