Efficient Rh(III)-catalyzed C-H activation of different classes of (hetero)arenes such as 2-phenylpyridine, indoles, aryl ketones and acetanilide and their dehydrogenative cross-coupling with allylic alcohols are described. Several important skeletons such as beta-aryl aldehydes and ketones, 2-acetylindenes, 3,4-dihydro-1H-quinolin-2-one and quinoline could be produced using this protocol.
Rhodium(III)-Catalyzed Coupling of Arenes with Cyclopropanols via C–H Activation and Ring Opening
作者:Xukai Zhou、Songjie Yu、Lingheng Kong、Xingwei Li
DOI:10.1021/acscatal.5b02414
日期:2016.2.5
Rhodium-catalyzed C–Hactivation of arenes has been established as an important strategy for the rapid construction of new bonds. On the other hand, ring-opening of readily available cyclopropanols has served as a driving force for the coupling with various nucleophiles and electrophiles. Nevertheless, these two important areas evolved separately, and coupling of arenes with cyclopropanols viaC–Hactivation has
Rh(III)-Catalyzed Acceptorless Dehydrogenative Coupling of (Hetero)arenes with 2-Carboxyl Allylic Alcohols
作者:Jintao Xia、Zhipeng Huang、Xukai Zhou、Xifa Yang、Feng Wang、Xingwei Li
DOI:10.1021/acs.orglett.7b03881
日期:2018.2.2
Rhodium(III)-catalyzed C–H activation of (hetero)arenes and redox-neutral coupling with 2-carboxyl allylic alcohols has been realized for the construction of β-aryl ketones. This reaction occurred efficiently at a relatively low catalyst loading via initialdehydrogenative alkylation to give a β-keto carboxylic acid, followed by decarboxylation.
rhodium(III)-catalyzed C-H alkylation of heterocycles with allylic alcohols has been achieved, which affords a series of β-aryl ketones in high yields. The reaction proceeds smoothly in water under air, and works well with heterocycles such as indoles, indolines, pyrroles and carbazoles. Notably, the expensive rhodium catalyst in water could be easily separated from the organic products, and reused for at least
C-8-Selective Allylation of Quinoline: A Case Study of β-Hydride vs β-Hydroxy Elimination
作者:Deepti Kalsi、Roshayed A. Laskar、Nagaraju Barsu、J. Richard Premkumar、Basker Sundararaju
DOI:10.1021/acs.orglett.6b01845
日期:2016.9.2
An unprecedented C(8)–H bond allylation of quinoline with allyl carbonate and allylalcohol catalyzed by Cp*Co(III) using a traceless directing group via β-oxygen and β-hydroxy elimination is described. This site-selective allylation reaction proceeds smoothly with various functional group tolerance including quinoxaline and phenanthridine. Under the nonoxidative reaction conditions, the difference