A palladium-catalyzed alkynylation of aromatic amines with terminal alkynes via in situ formed trimethylammonium salts is developed. Compared with previous system using ammonium salts as starting materials and high loading of pre-prepared NHC-Pd catalyst (10 mol% Pd), this reaction directly employed amines as the coupling partners and the commercially available Pd2(dba)3/PPh2Cy (1 mol% Pd) as the catalyst
Enantioselective <i>De Novo</i> Synthesis of α,α‐Diaryl Ketones from Alkynes
作者:Xueting Zhou、Qingqin Huang、Jiami Guo、Lei Dai、Yixin Lu
DOI:10.1002/anie.202310078
日期:2023.11.6
The enantioselective synthesis of α,α-diaryl ketonesfromalkynes through chiral phosphoric acid catalysis is demonstrated. This method also serves as an efficient deuteration method for the preparation of enantiomerically enriched α-deuterated α,α-diaryl ketones. Using the methodology, bioactive molecules, including one of the best-selling anti-breast cancer drugs, tamoxifen, are readily synthesized
Alkyl aryl tellurides and a tellurol ester were used as coupling partners in Pd(0)-catalyzed Sonogashira reactions. Microwave-assisted reactions of alkyl aryl tellurides with alkynes in the presence of Cut and catalytic amounts of Pd(PPh(3))(4) produced alkynyl arenes. Similarly, a tellurol ester on reaction with alkynes afforded alkynyl phenyl ketones in the presence of Cut and a catalytic amount of Pd(PPh(3))(4) at room temperature. (C) 2011 Elsevier Ltd. All rights reserved.