Preparation of 2,3-dihydroselenolo[2,3-b]pyridines and related compounds by free-radical means
作者:Tahli Fenner、Jonathan M. White、Carl H. Schiesser
DOI:10.1039/b515385a
日期:——
3-dihydroselenolo[2,3-b]pyridine (22) in 89% yield in a process presumably involving intramolecular homolytic substitution by a tertiary alkyl radical at selenium with loss of a benzyl radical. Alternatively, rearrangement of O-(omega-haloalkyl)esters 34 of 2-carboethoxy-N-hydroxypyridine-2-selone affords azonianaphthalenium halides 37 in 79% yield.
2-羰基乙氧基-2-(2-(苄基硒代)吡啶-3-基)十三烷基羧酸的硫代氢氧酸酯衍生物21的光解得到2-十二烷基-2-羰基乙氧基-2,3-二氢硒代苯并[2,3- b]吡啶(22),估计产率为89%,该过程可能涉及分子内均被硒中的叔烷基自由基分子内均质取代,而苄基自由基则丢失。备选地,2-羰基乙氧基-N-羟基吡啶-2-硒酮的O-(ω-卤代烷基)酯34的重排以79%的产率提供了氮杂萘并卤化萘37。