Copper-Catalyzed Bromination of C(sp<sup>3</sup>
)−H Bonds Distal to Functional Groups
作者:Tao Liu、Michael C. Myers、Jin-Quan Yu
DOI:10.1002/anie.201608210
日期:2017.1.2
Selective bromination of γ‐methylene C(sp3)−H bonds of aliphatic amides and δ‐methylene C(sp3)−H bonds of nosyl‐protected alkyl amines are developed using NBS as the brominating reagent and catalytic amount of CuII/phenanthroline complexes as the catalyst. Aryl and benzylic C−H bonds at other locations remain intact during this directed radical abstraction reaction.
使用NBS作为溴化试剂和催化量的Cu II /,开发了脂肪族酰胺的γ-亚甲基C(sp 3)-H键和由烷基保护的烷基胺的δ-亚甲基C(sp 3)-H键的选择性溴化。菲咯啉配合物为催化剂。在此定向自由基抽象反应过程中,其他位置的芳基和苄基CH键保持完整。
Palladium‐Catalyzed Aerobic γ‐C(sp3)−H Lactamization Using a NOx‐based Redox Mediator
Herein, we report a Pd-catalyzed aerobic lactamization of unactivated γ-C(sp3)–Hbonds of aliphaticcarboxylicacids and amino acids derivatives. The utilization of Pd(OAc)2 as a catalyst, along with catalytic AgNO2 as an electron transfer mediator, circumvents the need for stoichiometric oxidants and demonstrates significant practicality.
Monoselective gamma-C-H olefination and carbonylation of aliphatic acids has been accomplished by using a combination of a quinoline-based ligand and a weakly coordinating amide directing group. The reaction provides a new route for constructing richly functionalized all-carbon quaternary carbon centers at the beta-position of aliphatic acids.
Francois,H. et al., Bulletin de la Societe Chimique de France, 1970, # 2, p. 617 - 624