<i>N</i>-Alkoxy-4-methyl-5-(<i>p</i>-anisyl)thiazole-2(3<i>H</i>)thiones - New Precursors for Visible Light- or Thermally-Induced Alkoxyl Radical Reactions in Synthesis
作者:Jens Hartung、Thomas Gottwald、Kristina Špehar
DOI:10.1055/s-2003-36794
日期:——
Visible light-initiated or thermally induced N-O homolysis of hitherto unknown 4-methyl-5-(p-anisyl)-substituted N-alkoxythiazolethiones furnishes alkoxyl radicals, which have been applied in the diastereoselective synthesis of bicyclic tetrahydrofuran rac-5 (5-exo-trig cyclization), formation of erythrose derivative 8 (β-C,C cleavage), and the preparation of bromoalcohol 10 (via selective 1,5-H-translocation)
In a comparative study, reactions between 5-(p-methoxyphenyl)-substituted 3-alkoxy-4-methylthiazole-2(3H)-thiones and appropriate mediators (BrCCl3, Bu3SnH) provided higher yields of alkoxyl radical products (δ-bromohydrins, cyclic ethers, carbonyl compounds) than respective transformations of 5-phenyl- and 5-methyl-substituted derivatives. The unusual selectivity of applied thiohydroxamates to furnish