Photochemical Transformation of <i>O</i>
-(β-Arylethyl) Arylimidates into 2,4-Diaryl-5-iodoxazoles with 1,3-Diiodo-5,5-dimethylhydantoin
作者:Aya Saito、Hideo Togo
DOI:10.1002/ejoc.202000383
日期:2020.6.16
2,4‐Diaryl‐5‐iodoxazoles could be obtained by the treatment of O ‐(β‐arylethyl) arylimidates with 1,3‐diiodo‐5,5‐dimethylhydantoin (DIH) under irradiation with a tungsten lamp. This reaction proceeds through multiple stets, i.e., formation of N ‐iodoimidate, iminyl radical, 1,5‐H shift, 5‐exo‐tet cyclization to oxazoline, oxidation to oxazole, and iodination to 5‐iodoxazole.
在钨丝灯下用1,3-二碘-5,5-二甲基乙内酰脲(DIH)处理O-(β-芳基乙基)芳基亚氨酸酯可以得到2,4-二芳基-5-碘恶唑。该反应通过多个步骤进行,即形成N-碘亚氨酸盐,亚氨基,1,5-H转移,5- exet -tet环化为恶唑啉,氧化为恶唑和碘化为5-碘恶唑。