Photoredox-Mediated Direct Cross-Dehydrogenative Coupling of Heteroarenes and Amines
作者:Jianyang Dong、Qing Xia、Xueli Lv、Changcun Yan、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.8b02389
日期:2018.9.21
A photoredox-mediated direct cross-dehydrogenativecouplingreaction to accomplish α-aminoalkylation of N-heteroarenes is reported. This mild reaction has a broad substrate scope, offers the first general method for synthesis of aminoalkylated N-heteroarenes without the need for substrate prefunctionalization, and is scalable to the gram level. Furthermore, the reaction was found to be applicable to
A matter of catalyst: Azole compounds can be directly alkylated with N‐tosylhydrazones that bear unactivatedalkylgroups (see scheme; phen=1,10‐phenanthroline, Ts=p‐toluenesulfonyl). Nickel catalysis enables the introduction of simple secondary alkyl chains into benzoxazole compounds, whereas the alkylation of 5‐aryloxazoles and benzothiazole is possible by using a cobalt catalyst.
Visible-light induced decarboxylative C2-alkylation of benzothiazoles with carboxylic acids under metal-free conditions
作者:Bin Wang、Pinhua Li、Tao Miao、Long Zou、Lei Wang
DOI:10.1039/c8ob02476f
日期:——
C2-alkylation of benzothiazoles with aliphatic carboxylic acids was disclosed. In the presence of an acridinium salt as a photocatalyst and air as an oxidant, a wide range of secondary or tertiary aliphatic carboxylic acids were employed as alkylation reagents, providing the desired products in good to excellent yields under mild reaction conditions with a broad substrate scope.
A novel and efficient silver catalyzed decarboxylative direct C2-alkylation of benzothiazoles with carboxylic acids for the synthesis of 2-alkyl benzothiazoles was developed.
开发了一种新颖且高效的银催化脱羧直接C2烷基化苯并噻唑与羧酸的反应,用于合成2-烷基苯并噻唑。
Nickel-Catalyzed Coupling of Thiomethyl-Substituted 1,3-Benzothiazoles with Secondary Alkyl Grignard Reagents