Free radical reactions for heterocycle synthesis. Part 7: 2-Bromobenzoic acids as building blocks in the construction of spirobenzolactones and spirobenzolactams
作者:Wei Zhang、Georgia Pugh
DOI:10.1016/s0040-4020(03)00655-0
日期:2003.6
A straightforward 2-step parallel synthesis for structurally diversified spiro compounds is developed. 2-Bromobenzoic acids are used as common building blocks to couple with a series of conjugated enoles or enamines. Sequential intramolecular free radical Michael additions lead to formation of spirobenzolactones, spirobenzolactams, spirobenzolactone-lactams, spiorbenzolactone-thiolactones, spiordilactones
开发了一种简单的两步平行合成方法,用于结构上多样化的螺环化合物。2-溴苯甲酸用作常见的结构单元,与一系列共轭的烯醇或烯胺偶联。依次的分子内自由基迈克尔加成导致形成螺苯并内酯,螺苯并内酰胺,螺苯并内酯-内酰胺,螺苯并内酯-硫代内酯,螺二内酯和桥连螺内酯。