The Development of Efficient Protocols for the Palladium-Catalyzed Cyclization Reactions of Secondary Amides and Carbamates
作者:Bryant H. Yang、Stephen L. Buchwald
DOI:10.1021/ol9905351
日期:1999.7.1
[formula: see text] With the proper choice of palladium catalyst, ligand, and base, five-, six-, and seven-membered rings are formed efficiently from secondary amide or secondary carbamate precursors, offering significant improvements to currently existing methodology.
Novel phenylnaphthyl phosphines were prepared and applied to the Pd-catalyzed intramolecular amidation. Both ligands gave good to excellent yields in the synthesis of five-, six-, and seven-membered rings from halo-amides and carbamates.
Intramolecular palladium-catalyzed aryl amination and aryl amidation
作者:John P. Wolfe、Roger A. Rennels、Stephen L. Buchwald
DOI:10.1016/0040-4020(96)00266-9
日期:1996.5
treatment with a palladium catalyst and a suitable base, aromatic halides undergo intramolecular substitution to form five, six, and seven-membered rings. In a similar fashion aryl halides with pendant amides or sulfonamides are cyclized to form five and six-membered rings.
Delineating ligand effects in intramolecular aryl amidation reactions: formation of a novel spiro-heterocycle by a tandem cyclisation process
作者:Emma L. Cropper、Aui-Ping Yuen、Agnes Ford、Andrew J.P. White、King Kuok (Mimi) Hii
DOI:10.1016/j.tet.2008.10.098
日期:2009.1
Ligand effects for intramolecular Pd-catalysed aryl amidation reaction were examined for the synthesis of seven-membered benzolactam rings. In an attempt to produce an eight-membered ring, tandem C-N/C-O bond forming reactions occurred to give a novel spiro-benzofuran-lactam structure. (C) 2008 Elsevier Ltd. All rights reserved.