Copper-Catalyzed, Directing Group-Assisted Fluorination of Arene and Heteroarene C–H Bonds
摘要:
We have developed a method for direct, copper-catalyzed, auxiliary-assisted fluorination of beta-sp(2) C-H bonds of benzoic acid derivatives and gamma-sp(2) C-H bonds of alpha,alpha-disubstituted benzylamine derivatives. The reaction employs a CuI catalyst, a AgF fluoride source, and DMF, pyridine, or DMPU solvent at moderately elevated temperatures. Selective mono- or difluorination can be achieved by simply changing reaction conditions. The method shows excellent functional group tolerance and provides a straightforward way for the preparation of ortho-fluorinated benzoic acids.
A direct selenation of inert C–H bonds of benzamide derivatives and their related compounds with diselenides has been achieved with the palladium catalyst. The reaction was compatible with a variety of functional groups, including a bromo group. Primitive mechanistic insights revealed that the reaction proceeded through a C–H bond cleavage and the sequential oxidativeaddition of diselenides. The present
A simple and facile copper(II) mediated protocol for C-8 amination of 1-naphthylamide derivatives is reported here. Picolinamide and its derivatives were used as a bidentate directing group for the C-8 amination reaction. Various substituted naphthylamide derivatives with numerous cyclic and acyclic amines proceed in good yields under mild conditions. Air was used solely as an oxidant.
Directed Amination of Non-Acidic Arene CH Bonds by a Copper-Silver Catalytic System
作者:Ly Dieu Tran、James Roane、Olafs Daugulis
DOI:10.1002/anie.201300135
日期:2013.6.3
Amine meets arene: A method for direct amination of β‐C(sp2)Hbonds of benzoic acid derivatives and γ‐C(sp2)Hbonds of benzylamine derivatives has been developed. The reaction is catalyzed by Cu(OAc)2 and a Ag2CO3 cocatalyst, and shows high generality and functional‐group tolerance, as well as providing a straightforward means for the preparation of ortho‐aminobenzoic acid derivatives.
胺遇到芳烃:已经开发了一种直接胺化苯甲酸衍生物的 β-C(sp 2 ) H 键和苄胺衍生物的γ-C(sp 2 ) H 键的方法。该反应由Cu(OAc) 2和Ag 2 CO 3助催化剂催化,具有高度的通用性和官能团耐受性,并为制备邻氨基苯甲酸衍生物提供了一种直接的方法。
Traceless Directing Group Assisted Cobalt-Catalyzed C−H Carbonylation of Benzylamines
作者:Fei Ling、Chongren Ai、Yaping Lv、Weihui Zhong
DOI:10.1002/adsc.201700780
日期:2017.11.10
The first example of cobalt‐catalyzed C(sp2)−H carbonylation of benzylamines using a traceless directing group is reported, which was successfully applied to the synthesis of N−unprotected iso‐indolinones through direct C−H/N−H bonds activation. This protocol tolerates a variety of functional groups and provides a facile and efficient method for the formal synthesis of (+)‐garenoxacin.
报道了使用无痕导向基团的钴催化苄胺的C(sp 2)-H羰基羰基化的第一个实例,该实例已成功地用于通过直接CH / H / NH键活化而合成N-未保护的异吲哚啉酮。该方案可耐受多种官能团,并为(+)-加仑沙星的正式合成提供了一种简便而有效的方法。
Expedient Cobalt-Catalyzed C–H Alkynylation of (Enantiopure) Benzylamines
作者:Vinod G. Landge、Siba P. Midya、Jagannath Rana、Dinesh R. Shinde、Ekambaram Balaraman
DOI:10.1021/acs.orglett.6b02549
日期:2016.10.21
A unified strategy for cobalt-catalyzed ortho-C–H bond alkynylation of benzylamines is reported. Simple, commercially available CoBr2 was used as a cobalt source. The developed alkynylation strategy is robust and efficient and has a broad substrate scope including 1°, 2°, and 3° benzylamines. The mechanistic study shows that C–H bond cleavage is reversible, and the kinetic study illustrates that the