已开发出一种高效的钌 (II) 催化串联 C-C/C-N 键与芳基酰胺和 7-氮杂苯并降冰片二烯形成合成顺式稠合二氢苯并[ c ]菲啶酮。酰胺基团起导向基团和离去基团的作用,并提供了一种容易获得药学上有用的苯并[ c ]菲啶生物碱如尼替丁和法加罗宁类似物的途径。本方法与关于氮杂双环烯烃和芳族酰胺的各种官能团相容。氘标记研究提出并支持了涉及定向基团辅助 C-H 活化的反应机制。
Simple Synthesis of Amides and Weinreb Amides Using PPh3 or Polymer-Supported PPh3 and Iodine
作者:Amit Kumar、Hari Kiran Akula、Mahesh K. Lakshman
DOI:10.1002/ejoc.200901420
日期:2010.5
range of carboxylic acids to 2 degrees , 3 degrees , and Weinrebamides. Simplification of the procedure was possible with the use of polymer-supported PPh3/I2. Weinrebamides produced via the use of polymer-supportedPPh3 could be filtered through a short silica gel plug and used in further transformations. Thus, use of polymer-supportedPPh3 offers potential applicability to diversity-oriented reactions
已经证明,PPh 3 / I 2的组合对于将一系列羧酸转化为2度,3度和Weinreb酰胺是有效的。使用聚合物负载的PPh3 / I2可以简化程序。通过使用聚合物负载的PPh3制备的Weinreb酰胺可以通过短硅胶塞过滤,并用于进一步的转化。因此,使用聚合物负载的PPh3可为面向多样性的反应提供潜在的适用性。通过使用这种酰胺形成方法,已经完成了载脂蛋白和普拉托恩的正式全部合成,以及脱水胆碱酮和马来帕定的合成。已尝试获得对该反应的了解。
Novel Benzofuran and Benzothiophene Biphenyls as Inhibitors of Protein Tyrosine Phosphatase 1B with Antihyperglycemic Properties
作者:Michael S. Malamas、Janet Sredy、Christopher Moxham、Alan Katz、Weixin Xu、Robert McDevitt、Folake O. Adebayo、Diane R. Sawicki、Laura Seestaller、Donald Sullivan、Joseph R. Taylor
DOI:10.1021/jm990560c
日期:2000.4.6
tyrosine phosphatases (PTPases) have been shown to be negative regulators of the insulin receptor. Inhibition of PTPases may be an effective method in the treatment of Type 2 diabetes. We have identified two novel series of benzofuran/benzothiophenebiphenyl oxo-acetic acids and sulfonyl-salicylic acids as potent inhibitors of PTP1B with good oral antihyperglycemic activity. To assist in the design of these
Synthesis of 4-Aryl-1,7-naphthyridine-2(1H)-thiones by the Electrocyclic Reaction of 4-(1-Arylalk-1-enyl)-3-isothiocyanatopyridines Generated in situ from the Corresponding Isocyanides
7‐naphthyridine‐2(1H)‐thiones 7 has been developed. The method is based on the electrocyclicreaction of 4‐(1‐arylalk‐1‐enyl)‐3‐isothiocyanatopyridines 6, generated in situ by the treatment of the respective isocyanides 5 with S8 in the presence of a catalytic amount of selenium. The isocyanides 5 can be easily prepared from commercially available pyridin‐3‐amine by conventional organic reactions.
Palladium-Catalyzed Carbonylation Reactions of Aryl Bromides at Atmospheric Pressure: A General System Based on Xantphos
作者:Joseph R. Martinelli、Donald A. Watson、Dominique M. M. Freckmann、Timothy E. Barder、Stephen L. Buchwald
DOI:10.1021/jo801279r
日期:2008.9.19
A method for the Pd-catalyzed carbonylation of aryl bromides has been developed usingXantphos as the ligand. This method is effective for the direct synthesis of Weinreb amides, primary and secondary benzamides, and methyl esters from the corresponding aryl bromides at atmosphericpressure. In addition, a putative catalytic intermediate, (Xanphos)Pd(Br)benzoyl, was prepared and an X-ray crystal structure
An Efficient synthesis of Weinreb amides and ketones via palladium nanoparticles on ZIF-8 catalysed carbonylative coupling
作者:Tuan Thanh Dang、Anqi Chen、Abdul Majeed Seayad
DOI:10.1039/c4ra04614e
日期:——
such as aminocarbonylation and Suzuki-carbonylation are reported using Pd nanoparticles supported on ZIF-8 for efficient and environmentally attractive synthesis of Weinreb amides and ketones from aryl bromides or iodides. The catalyst is air stable, offers high activity with very low palladium leaching and is recyclable. The presence of a phosphine ligand was required when aryl bromides were used as substrates