Homolytic substitution by iminyl radical at selenium: A free-radical route to 1,2-benzoselenazoles
作者:Mei C. Fong、Carl H. Schiesser
DOI:10.1016/s0040-4039(00)79347-6
日期:1993.7
2-(benzylseleno)propiophenone (1: R = Et) decompose smoothly, upon irradiation, with the loss of carbon dioxide and formaldehyde to give the 1,2-benzoselenazoles (5). The reaction presumably involves the iminyl radical intermediate (4) which undergoes intramolecular free-radical homolytic substitution at selenium to afford the product (5).
衍生自2-(苄基
硒代)-
苯甲醛(1:R = H),2-(苄基
硒代)
苯乙酮(1:R = Me)和2-的O-car☐y甲基
肟衍
生物(2)的
硫代异羟
肟酸酯(3)(
苄基硒基)
苯乙酮(1:R = Et)在辐射下会平稳分解,并损失
二氧化碳和
甲醛,得到1,2-苯并
硒基唑(5)。该反应大概涉及
亚胺基自由基中间体(4),该
亚胺基中间体在
硒上进行分子内自由基均溶取代,得到产物(5)。