Annulated heterocycles through a radical-cation cyclization: synthetic and mechanistic studies
作者:Jeffrey B. Sperry、Dennis L. Wright
DOI:10.1016/j.tet.2006.03.058
日期:2006.7
and thiophenes, especially reactions leading to dearomatization of the nucleus, make them highly versatile synthons for complex molecule construction. As part of a program to exploit this intrinsic reactivity, we have developed a convenient method to prepare annulated versions of these heterocycles. The strategy is based on a two-step annulation involving the initial conjugate addition of a heteroaryl
呋喃和噻吩可能进行广泛的化学转化,特别是导致原子核脱芳构的反应,使其成为用于复杂分子构建的高度通用的合成子。作为开发这种内在反应性的计划的一部分,我们已经开发了一种方便的方法来制备这些杂环的环状形式。该策略基于两步退火,其中包括将杂芳基有机金属初始共轭添加到烯酮中,同时捕获烯醇盐作为甲硅烷基烯醇醚。该分子的阳极氧化导致自由基阳离子的最初形成,该自由基阳离子被杂芳基封端的环化捕获,从而得到环状产物。