Triarylmethanes and their Medium‐Ring Analogues by Unactivated Truce–Smiles Rearrangement of Benzanilides
作者:Roman Abrams、Mehul H. Jesani、Alex Browning、Jonathan Clayden
DOI:10.1002/anie.202102192
日期:2021.5.10
Intramolecular nucleophilic aromatic substitution (Truce–Smiles rearrangement) of the anions of 2‐benzyl benzanilides leads to triarylmethanes in an operationally simple manner. The reaction succeeds even without electronic activation of the ring that plays the role of electrophile in the SNAr reaction, being accelerated instead by the preferred conformation imposed by the tertiary amide tether. The
2-苄基苯甲酰苯胺阴离子的分子内亲核芳族取代(Truce-Smiles重排)导致三芳基甲烷的操作简单。即使没有在S N Ar反应中起亲电作用的环的电子活化反应也能成功进行,反而会被叔酰胺系链所施加的优选构象所加速。可以除去产物的酰胺取代基或将其转化为替代的官能团。反应的扩环变体(n至n + 4)为双苯并稠合的10或11个成员的中环内酰胺提供了一条途径。Hammett分析得出的ρ值与部分协调的反应机理的操作一致。