3-Isocyanoisobenzofuran-1(3H)-ones (phthalides) were prepared in two steps from the corresponding phthalaldehydic acids. The 3-isocyanoisobenzofuran-1(3H)-ones are readily rearranged to the corresponding 3-cyanoisobenzofuran-1(3H)-ones using triflic anhydride and 2,6-lutidine, thus enabling the synthesis of 3-cyanoisobenzofuran-1(3H)-ones without using toxic cyanide. Furthermore their annulation with Michael acceptors
Angucycline C5 Glycosides: Regio- and Stereocontrolled Synthesis and Cytotoxicity
作者:Prithiba Mitra、Birendra Behera、Tapas K. Maiti、Dipakranjan Mal
DOI:10.1021/jo4013892
日期:2013.10.4
This study discloses a general and convergent route for the regio- and stereospecific construction of the C5 glycosyl angucycline framework of mayamycin. C-Glycosidation, dearomatization, and Hauser annulation are the key steps. The synthetic analogues show cytotoxicity against different human cancer cell lines with IC50 values between 16.4 and 1.2 μM.