Methods of selectively forming substituted pyrazines
申请人:R. J. Reynolds Tobacco Company
公开号:US11091446B2
公开(公告)日:2021-08-17
Methods of selectively forming substituted pyrazines are provided. Methods of the present invention can include receiving a reaction solution including at least one carbon source and at least one nitrogen source, and heating the reaction solution to a reaction temperature and holding the reaction solution at the reaction temperature for a time sufficient to produce a reaction product comprising at least one substituted pyrazine. The carbon source can be selected from the group consisting of hydroxy ketone(s), sugar(s) treated with at least one buffer, and combinations thereof. Tobacco products incorporating substituted pyrazines are also provided.
The indirect electrooxidation of ketones in ammoniacal methanol using iodide ion as a mediator afforded 2,2-dialkyl-2,5-dihydro-1H-imidazoles 3 via an oxidative cyclocoupling of ketimine intermediates formed from ketones and ammonia. The treatment of 3 with dilute HCl gave alpha-amino ketone hydrochlorides 4 and the parent ketones in good yields. A similar electrooxidation of 3 resulted in the formation of the corresponding W-imidazoles 6, which were hydrolyzed to alpha-diketones and the parent ketones. The same products 6 could also conveniently be obtained by chemical oxidation of 3 with aqueous NaOCl.
Synthese und Verhalten aliphatisch substituierter Imadazoline-?3
作者:F. Asinger、M. Thiel、R. Sowada
DOI:10.1007/bf00901692
日期:——
Kalischer, Chemische Berichte, 1895, vol. 28, p. 1518