Metal-free visible light-promoted synthesis of isothiazoles: a catalytic approach for N–S bond formation from iminyl radicals under batch and flow conditions
applying photoredoxcatalysis. This simple strategy features mild conditions, broad scope and wide functional group tolerance representing a new enviromentally friendly option to prepare these highly valuable heterocycles. Furthermore, the synthetic value of the method is highlighted by the preparation of a natural product derivative and the implementation of the reaction in a continuousflow setup.
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 homolyticsubstitution at selenium to afford the product (5).