A route to cyclic peroxides containing 1,2-dioxolane, 1,2-dioxane or 1,2-dioxepane rings is described. These compounds present simpler structures related to the bicyclic core of stolonoxides, metabolites with marked cytotoxicity against several mammalian tumor cell lines, isolated from the marine tunicate Stolonica socialis. The key synthetic step consists in the intramolecular Michael addition of a secondary hydroperoxide group to an α,β-unsaturated ester. 相似文献
The crystal and molecular structure of 1,2-diphenyl-1,2-diphospholane-1, 2-disulphide has been determined from three dimensional X-ray diffraction data by Patterson and Fourier techniques. The structure has been refined by full matrix least squares methods to a final R value of 0.055 based on 1733 observed reflexions. The unit cell is orthorhombic, space group P212121, with dimensions a = 13.867 Å, b = 12.379 Å and c = 9.312 Å (all ± 0.003 Å), and contains 4 molecules. The PP bond length of 2.253 ± 0.002 Å is similar to that in several diphosphine disulphides and phosphorus sulphides, and indicates the absence of any π bonding in the PP bond. 相似文献