Copper-Catalyzed Modular Amino Oxygenation of Alkenes: Access to Diverse 1,2-Amino Oxygen-Containing Skeletons
作者:Brett N. Hemric、Andy W. Chen、Qiu Wang
DOI:10.1021/acs.joc.8b02885
日期:2019.2.1
Copper-catalyzed alkeneamino oxygenation reactions using O-acylhydroxylamines have been achieved for a rapid and modular access to diverse 1,2-amino oxygen-containing molecules. This transformation is applicable to the use of alcohols, carbonyls, oximes, and thio-carboxylic acids as nucleophiles on both terminal and internal alkenes. Mild reaction conditions tolerate a wide range of functional groups
A mild new procedure for production, cyclization and trapping of amidyl radicals: application to a formal total synthesis of peduncularine
作者:Xichen Lin、Didier Stien、Steven M Weinreb
DOI:10.1016/s0040-4039(00)00194-5
日期:2000.4
TEMPO affords a functionalized product derived from an amidyl radical cyclization. The methodology has been used in a formal total synthesis of the 6-azabicyclo[3.2.1]octane-containing indole alkaloidpeduncularine.
Development of efficient new methodology for generation, cyclization and functional trapping of iminyl and amidyl radicals
作者:Xichen Lin、Gerald D. Artman、Didier Stien、Steven M. Weinreb
DOI:10.1016/s0040-4020(01)00878-x
日期:2001.10
New methodology has been devised for the generation and subsequent cyclization of iminyl and amidyl radicals under mild conditions. The process involves either the treatment of oximes with 2,6-dimethylbenzenesulfinyl chloride, or the treatment of hydroxamic acids with tert-butylsulfinyl chloride (-50 degreesC to rt), to give the corresponding nitrogen radicals, followed by cyclization onto pendant olefins. Radical traps such as diphenyl diselenide, diphenyl disulfide, and TEMPO can be used to terminate the cyclizations, thus introducing functionality that provides multiple options for further manipulation. In a more convenient procedure, both iminyl and amidyl radical cyclizations can be initiated using commercially available diethyl chlorophosphite which generally provides similar (with diphenyl disulfide and TEMPO) or significantly higher (with diphenyl diselenide) yields of products. (C) 2001 Elsevier Science Ltd. All rights reserved.