Chlorospermines A and B are biologically interesting acridone natural products and recently isolated from Glycosmis chlorosperma.We report here a convergent approach to construct the tetracyclic core of the natural pr...Chlorospermines A and B are biologically interesting acridone natural products and recently isolated from Glycosmis chlorosperma.We report here a convergent approach to construct the tetracyclic core of the natural products.The two fragments are assembled together through Sonogashira coupling,and a cis-triene intermediate was prepared by using hydrosilylation/desilylation.A 6p-electrocyclization/aromatization sequence served as the key step of the synthesis,which formed the tetrasubstituted arene motif in one pot.展开更多
An algorithm is proposed for the fast reconstruction of off-axis digital holograms based on a combination of complex encoding（CE） and spatial multiplexing（SM）. In this algorithm, every two off-axis holograms recor...An algorithm is proposed for the fast reconstruction of off-axis digital holograms based on a combination of complex encoding（CE） and spatial multiplexing（SM）. In this algorithm, every two off-axis holograms recorded in sequence are first assembled into a CE hologram using the CE method, and then four of the CE holograms are again encoded into one complex spatial multiplexing（CSM） hologram based on the SM algorithm. It is demonstrated that the eight holograms encoded into such one CSM hologram can be quickly reconstructed by performing a two-dimensional（2D） Fourier transform（FT） on the CSM hologram. Using this method, the eight 2D FTs required for the reconstruction of the eight holograms in the conventional spatial filtering methods can be simplified to a process with only one 2D FT, which can largely improve the computation efficiency with the展开更多
基金Ministry of Science & Technology (No.2013CB836900)National Natural Science Foundation of China (Nos.21290180,21172235 and 21222202)China Postdoctoral Science Foundation (No.2014M561537,M.Y.)
文摘Chlorospermines A and B are biologically interesting acridone natural products and recently isolated from Glycosmis chlorosperma.We report here a convergent approach to construct the tetracyclic core of the natural products.The two fragments are assembled together through Sonogashira coupling,and a cis-triene intermediate was prepared by using hydrosilylation/desilylation.A 6p-electrocyclization/aromatization sequence served as the key step of the synthesis,which formed the tetrasubstituted arene motif in one pot.
基金supported by National Natural Science Foundation of China under Grant No.11474186
文摘An algorithm is proposed for the fast reconstruction of off-axis digital holograms based on a combination of complex encoding（CE） and spatial multiplexing（SM）. In this algorithm, every two off-axis holograms recorded in sequence are first assembled into a CE hologram using the CE method, and then four of the CE holograms are again encoded into one complex spatial multiplexing（CSM） hologram based on the SM algorithm. It is demonstrated that the eight holograms encoded into such one CSM hologram can be quickly reconstructed by performing a two-dimensional（2D） Fourier transform（FT） on the CSM hologram. Using this method, the eight 2D FTs required for the reconstruction of the eight holograms in the conventional spatial filtering methods can be simplified to a process with only one 2D FT, which can largely improve the computation efficiency with the
