The target compound was provided through a five-step procedure starting from maleic anhydride with corresponding total yields of 31%,24%and 35% respectively. The structure was verified by ~ 1 H-NMR and HRMS.

• 以起始物马来酸酐计,得到目标产物5步反应总收率分别为31%25(BS3),24%25(DTSSP),35%25(DTSSB),目标产物经质谱(1H-NMR)和高分辨率质谱(HRMS)得到确证。