Synthesis of Aryl- and Heteroaryl-Substituted 3-Benzyloxyisothiazoles via Suzuki and Negishi Cross-Coupling Reactions
作者:Birgitte H. Kaae、Povl Krogsgaard-Larsen、Tommy N. Johansen
DOI:10.1021/jo035578g
日期:2004.2.1
Introduction of aryl and heteroaryl substituents into the 5-position of 3-benzyloxyisothiazole (1) using palladium-catalyzed Suzuki and Negishi cross-coupling reactions was investigated. Attempts to generate synthetically viable nucleophilic species from I for Suzuki- or Negishi-type cross-couplings were unsuccessful. However, using 3-benzyloxy-5-iodoisothiazole 2 as an intermediate, a range of aromatic and heteroaromatic substituents were successfully introduced under Suzuki or Negishi cross-coupling conditions in good to excellent yields.