Regio- and Stereoselective Iodoacyloxylations of Alkynes
摘要:
A new method for the regioselective and stereoselective iodoacyloxylation of alkynes has been developed. This protocol utilizes a combination of an iodobenzene dicarboxylate and iodine to functionalize a series of activated and unactivated alkynes in an entirely selective and predictable fashion. The resultant iodo-enol ester were subsequently coupled with boronic acids to afford tetrasubstitute alkene derivatives, which could be further converted to the corresponding 1,1-disubstituted acetophenone.
Palladium-Catalyzed Denitrative α-Arylation of Ketones with Nitroarenes
作者:Zhirong Li、Yonggang Peng、Tao Wu
DOI:10.1021/acs.orglett.0c04104
日期:2021.2.5
The palladium-catalyzed α-arylation of ketones with readily available nitroarenes and nitroheteroarenes provides access to useful α-aryl and α-heteroaryl ketones. The use of the Pd/BrettPhos catalysts was critical to achieve high efficiency for these transformations, whereas other catalysts led to decreased yields or no conversions. The intramolecular type substrate was also applied in this methodology
PROCESS FOR CREATING CARBON-CARBON BONDS USING CARBONYL COMPOUNDS
申请人:CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (C.N. R.S.)
公开号:US20150166464A1
公开(公告)日:2015-06-18
The present invention concerns a process for preparing a compound of formula (I) by reaction between a compound of formula (II) and a compound of formula (III) in the presence of a copper-containing catalyst, a ligand and base. The invention also concerns the implementing of this process for the preparation of building blocks to prepare molecules of interest in particular in the pharmaceutical, agro-chemical fields, etc.
No activation needed: The first efficient method for direct α‐arylation of non‐activated or non‐protected family of enolizable ketones with simple aryliodides employs a catalytic copper system. The method shows potential for the easy and step‐economical synthesis of tamoxifen, the most commonly administrated drug for the management of breast cancer. R, R′, R′′ = electron‐donating or electron‐withdrawing