A novel tandem method to synthesize 2-azaaryl indoline promoted by LiN(SiMe3)2 from 2-azaaryl methyl amine and 2-fluoro benzyl bromides was developed. Mechanistic investigation indicated that this tandem cyclization was initiated by selective benzyl C-SN2 substitution followed by an intramolecular SNAr reaction. Diverse 2-azaaryl indoles could also be obtained via simple functional transformations
开发了一种在LiN(SiMe 3 ) 2 催化下,由2-氮杂芳基甲胺和2-氟苄基溴串联合成2-氮杂芳基二氢吲哚的新方法。机理研究表明,这种串联环化是通过选择性苄基CS N 2 取代和随后的分子内S N Ar 反应引发的。通过简单的功能转化也可以获得多种2-氮杂芳基吲哚。
Switching and Conformational Fixation of Amides Through Proximate Positive Charges
作者:Amelie L. Bartuschat、Karina Wicht、Markus R. Heinrich
DOI:10.1002/anie.201502474
日期:2015.8.24
Tertiary amides, which usually occur as cis/trans mixtures, can be effectively shifted to the cis conformation by placing a positive charge in close proximity to the amide carbonyl. This effect was used to prepare cis‐configured prolyl amides and to facilitate a strongly rotamer‐dependent radical cyclization.