Copper-mediated oxidative homocoupling and rearrangement of N-alkoxyamides: an efficient method for the preparation of aromatic esters
作者:Xiyan Duan、Kun Yang、Shuang Tian、Junying Ma、Yaning Li、Jiao Zou、Dongliang Zhang、Huanqing Cui
DOI:10.1016/j.tetlet.2015.06.023
日期:2015.7
N-Alkoxyamides are successfully converted into their corresponding esters in a moderate to satisfactory yields via copper-catalyzed oxidative homocoupling and Heron rearrangement. The process tolerates a wide variety of functional groups and allows the synthesis of sterically hindered ester products not readily accessible by traditional acylation chemistry. A radical-mediated pathway has been tentatively
An Electrochemical Method for Carboxylic Ester Synthesis from <i>N</i>-Alkoxyamides
作者:Kripa Subramanian、Subhash L. Yedage、Bhalchandra M. Bhanage
DOI:10.1021/acs.joc.7b01473
日期:2017.10.6
An electrochemical method for the synthesis of carboxylic as well as hindered esters from N-alkoxyamides has been reported. The electrochemical reaction proceeds through constant current electrolysis (CCE) by taking advantage of the dual role of n-Bu4NI (TBAI) as the redox catalyst as well as the supporting electrolyte. Besides providing mild reaction conditions, the present protocol is free from external
Preparation and Thermal Decomposition of N,N'-Diacyl-N,N'-Dialkoxyhydrazines: Synthetic Applications and Mechanistic Insights
作者:Mauro V. De Almeida、Derek H. R. Barton、Ian Bytheway、J. Albert Ferreira、Michael B. Hall、Wansheng Liu、Dennis K. Taylor、Lisa Thomson
DOI:10.1021/ja00122a018
日期:1995.5
Oxidation of various O-alkyl hydroxamates 1 where R(1) was a keto-methoxime, benzoyl, aryl, or alkyl group with eerie ammonium nitrate (CAN) or nickel peroxide (NiO2 . H2O) leads to the corresponding esters in high yield. This augurs well for the facile synthesis of highly hindered esters. Dimers of type 2 were identified as intermediates in these oxidations, and a combination of experimental and theoretical results suggest that these dimers decompose in a stepwise 1,1-elimination manner via intermediate nitrenes to furnish the esters and not via a stepwise 1,2-elimination sequence as previously thought.