Palladium-Catalyzed meta-C–H Olefination of Arene-Tethered Diols Directed by Well-Designed Pyrimidine-Based Group
摘要:
The palladium-catalyzed meta-olefination of arene-tethered diols attached to a well-designed pyrimidine moiety is presented. Applications of the protocol are illustrated by the synthesis of various diol-based natural products, such as coumarins, phenylpropanoids, stilbenes, and chalcones. Advantages of this method are demonstrated through the easy removal of the template and a gram-scale olefination reaction. Finally, experimental verification, including H-1 NMR, ESI-MS and IR, and DFT studies are undertaken to elucidate the mechanistic complexity.
Design and synthesis of functionalized trisaccharides as p53-peptide mimics
摘要:
Oligosaccharides represent potentially useful scaffolds for the development of peptidomimetics. We report here the design and synthesis of functionalized trisaccharides modeled after an alpha-helical 15-mer peptide region of p53 which binds to its cellular regulator MDM2. The trisaccharide scaffold was obtained efficiently by applying the sulfoxide glycosylation reaction as a key methodology. (C) 2010 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Regioselective Allylation of Chloromethyl(hetero)arenes with Allyl Pinacolborate
作者:Sheng Zhang、Aziz Ullah、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/adsc.201700350
日期:2017.8.17
The palladium-catalyzed regioselective allylation reaction between chloromethyl(hetero)arenes and allyl pinacolborate is reported in this work. Chloromethylarenes smoothly reacted with allyl pinacolborate, producing para-allylated dearomatization products or para-allylated arenes in satisfactory to good yields. 2-(Chloromethyl)thiophenes and 2-(chloromethyl)furans bearing substituents on the 5-positions
A ternary and synergistic chiral primary amine/palladium /p-hydroquinone catalysis was developed to facilitate oxidative asymmetric allylic C−H alkylation under aerobic conditions with high regio- and enantioselectivity.