Starting from paramagnetic β-bromo-α,β-unsaturated aldehyde 1, β-bromo-α,β-unsaturated nitrile 2 and diene 3 heterocycles 4-10 and carbocycles 12-14, 16, and 17 were synthesized with simple procedures in the presence of a nitroxide moiety. A complex-forming paramagnetic phenanthroline 19 is also described.
Palladium-Catalyzed Coupling Reactions of Paramagnetic Vinyl Halides
作者:Kálmán Hideg、Tamás Kálai、Mária Balog、József Jekő、Wayne. L. Hubbell
DOI:10.1055/s-2002-35240
日期:——
Suzuki. Heck and Sonogishira coupling reactions of paramagnetic vinyl bromides 1-6 gave monofunctional (7a,b), homobifunctional (8a,b, 24), and heterobifunctional pyrroline nitroxide; (9-19, 31) under mild conditions in aone-step reaction. From these compounds thiol-specific spin labels 26 and 28 and pyrroline nitroxide annulated heterocycles 30 and 32 were synthesized. The ethynyl derivative of pyrroline