Palladium-Catalyzed Direct β-C−H Arylation of Ketones with Arylboronic Acids in Water
作者:Xiaoyun Hu、Xiaobo Yang、Xi-Jie Dai、Chao-Jun Li
DOI:10.1002/adsc.201700277
日期:2017.7.17
A palladium‐catalyzed direct β‐C−H arylation of ketones was developed under mild conditions in water, featuring commercially available arylboronic acids as nucleophilic aryl sources and o‐iodoxybenzoic acid as the oxidant. The method provides a concise route to access β‐arylated ketones. Preliminary studies indicated that direct asymmetric β‐C−H arylation of ketones could be achieved by this strategy
Compounds of general formula (I) their use as calcium receptor-active compounds for the prophylaxis, treatment or amelioration of physiological disorders or diseases associated with disturbances of CaSR activity, such as hyperparathyroidism, pharmaceutical compositions comprising said compounds, and methods of treating diseases with said compounds.
Selective Heck reaction of aryl bromides with cyclopent-2-en-1-one or cyclohex-2-en-1-one
作者:Yacoub Fall、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tet.2008.11.006
日期:2009.1
The selective Heck reaction of cyclopent-2-en-1-one or cyclohex-2-en-1-one with aryl bromides gives a simple access to the corresponding 3-arylcycloalk-2-en-1-ones. The choice of the base was found to be crucial to avoid the formation of 3-arylcyclopentanones or 3-arylcyclohexanones as side-products. Using KF as base, DMF as solvent and Pd(OAc)(2) as catalyst, the target products were obtained in moderate to good yields with a variety of aryl bromides. Substituents such as fluoro, trifluoromethyl, acetyl, benzoyl, formyl, ester or nitrile on the aryl bromide are tolerated. Sterically congested aryl bromides or bromopyridines can also be employed. (C) 2008 Elsevier Ltd. All rights reserved.
pH-Dependent conjugate addition of arylboronic acids to α,β-unsaturated enones catalyzed by a reusable palladium(II)/cationic 2,2′-bipyridyl system in water under air
作者:Shao-Hsien Huang、Tzu-Min Wu、Fu-Yu Tsai
DOI:10.1002/aoc.1654
日期:2010.9
A reusable Pd(NH3)2Cl2/cationic 2,2′‐bipyridyl system for the catalysis of the conjugateaddition of arylboronic acids to α,β‐unsaturated enones in water under air was developed. Addition of arylboronic acids to both cyclic and acyclic enones progressed smoothly, providing the products in good to high yields, the best result being obtained when HBF4 was used to adjust the pH value to 1.0. After the
Catalytic activation of carbon–carbon bonds in cyclopentanones
作者:Ying Xia、Gang Lu、Peng Liu、Guangbin Dong
DOI:10.1038/nature19849
日期:2016.11
we report a general approach to the catalytic activation of C–C bonds in simple cyclopentanones and some cyclohexanones. The key to our success is the combination of a rhodium pre-catalyst, an N-heterocyclic carbene ligand and an amino-pyridine co-catalyst. When an aryl group is present in the C3 position of cyclopentanone, the less strained C–C bond can be activated; this is followed by activation of