NHC-Organocatalyzed C<sub>Ar</sub>
−O Bond Cleavage: Mild Access to 2-Hydroxybenzophenones
作者:Daniel Janssen-Müller、Santanu Singha、Fabian Lied、Karin Gottschalk、Frank Glorius
DOI:10.1002/anie.201610203
日期:2017.5.22
rearrangement of acyl-anion equivalents generated by N-heterocyclic carbene (NHC) catalysis has been achieved. The developed method includes CAr−O, CAr−S, or CAr−N bond cleavage for the formation of a CAr−C bond and enables access to 2-hydroxybenzophenones, an important structural motif that is present in several bioactive natural products. By utilizing this procedure, the alkaloid taxilamine was synthesized
N杂环卡宾(NHC)催化产生的酰基阴离子当量的Truce-Smiles重排已实现。所开发的方法包括裂解C Ar -O,C Ar -S或C Ar -N键以形成C Ar -C键,并能够获得2-羟基二苯甲酮,这是几种生物活性天然存在的重要结构基序产品。通过使用该程序,生物碱紫杉胺分三步合成。DFT计算和控制实验支持经典S NAr机理是与催化剂结合的Meisenheimer型中间体。该方法具有温和的反应条件,出色的官能团耐受性和广泛的底物范围,包括各种类别的(杂)芳烃。