Chemo-, Regio-, and Stereoselective Silver-Catalyzed Aziridination of Dienes: Scope, Mechanistic Studies, and Ring-Opening Reactions
作者:Josep Llaveria、Álvaro Beltrán、W. M. C. Sameera、Abel Locati、M. Mar Díaz-Requejo、M. Isabel Matheu、Sergio Castillón、Feliu Maseras、Pedro J. Pérez
DOI:10.1021/ja412547r
日期:2014.4.9
of 2,4-diene-1-ols in a chemo-, regio-, and stereoselective manner to give vinylaziridines in high yields by means of the metal-mediated transfer of NTs (Ts = p-toluensulfonyl) units from PhI═NTs. The preferential aziridination occurs at the double bond neighboring to the hydroxyl end in ca. 9:1 ratios that assessed a very high degree of regioselectivity. The reaction with the silver-based catalysts
带有三吡唑基硼酸酯配体 (Tp(x)) 的银配合物以化学、区域和立体选择性的方式催化 2,4-diene-1-ols 的氮丙啶化,通过金属介导的转移以高产率得到乙烯基氮丙啶来自 PhI=NTs 的 NTs(Ts = 对甲苯磺酰基)单元。优先氮丙啶化发生在与羟基末端相邻的双键上。9:1 的比率评估了非常高的区域选择性。与银基催化剂的反应以立体定向方式进行,即,C=C 键的初始构型保持在氮丙啶产物(顺式或反式)中。借助 DFT 研究解释了区域选择性的程度,其中 2,4-二烯-1-醇的 OH 基团的导向作用起着关键作用。新氮丙啶开环的有效策略,