In the presence of copper(I) salts, 3-bromo- or 3-iodoisoxazoles undergo isoxazoleringopening to give keto amines that can undergo further one-pot cascade cross-coupling/recyclization transformation into an extended flat polyaromatic ring system that can provide an interesting new platform for the design of DNA intercalators. If necessary, the three-step reaction cascade can be interrupted at a desired
Chameleonic Reactivity of Vicinal Diazonium Salt of Acetylenyl-9,10-anthraquinones: Synthetic Application toward Two Heterocyclic Targets
作者:A. A. Stepanov、L. M. Gornostaev、S. F. Vasilevsky、E. V. Arnold、V. I. Mamatyuk、D. S. Fadeev、B. Gold、I. V. Alabugin
DOI:10.1021/jo2014214
日期:2011.11.4
the aryl alkyne moiety and an OAc substituent at C4. The latter process provides a new synthetic route to 3-ethynyl-[1,9-cd]isoxazol-6-ones that are difficult to access otherwise. DFT calculations suggest that donor substituents have only a minor effect on alkyne and diazonium polarization in the reactant but provide specific transition state stabilization by stabilizing the incipient vinyl cation.