Thermal decomposition of the tert-butyl perester of thymidine-5′-carboxylic acid. Formation and fate of the pseudo-C4′ radical
作者:Pier Carlo Montevecchi、Antonio Manetto、Maria Luisa Navacchia、Chryssostomos Chatgilialoglu
DOI:10.1016/j.tet.2004.03.029
日期:2004.5
acid 1 carried out at 85 °C in different solvents affords the tert-butylacetal 4a, deriving from in cage decomposition, and pseudo C4′ radicals 2. Radicals 2 can be reduced to 5 by hydrogen atom abstraction from thiol (thiophenol or glutathione) or THF, or can be oxidized to cations 8 by dioxygen or perester 1 itself. Cations 8 are stereoselectively trapped by the nucleophilic solvent (tert-butanol
的热分解的叔胸苷-5'-羧酸的丁基过酸酯1在不同溶剂中,在85℃下进行,得到叔-butylacetal 4a中,从在笼分解导出,和伪C4'基团2。自由基2可以通过从硫醇(硫酚或谷胱甘肽)或THF中夺取氢原子而还原为5,或者可以被双氧或过酸酯1本身氧化为阳离子8。阳离子8被亲核溶剂(叔丁醇,甲醇,水)立体选择性捕获,得到缩醛4a - c。