A facile synthesis of 3-alkoxy and 3-amino pyrroles
摘要:
N-Amino-3-methoxy-3-pyrrolines 2 obtained from the reaction of 1-lithio methoxyallene with arylhydrazones may be converted to either 3-methoxy pyrroles 6 or 3-amino pyrroles 7 by treatment with m-chloroperbenzoic acid or 0.25 M HCl, respectively. (C) 1999 Elsevier Science Ltd. All rights reserved.
carbon atoms. Furthermore, aliphatic aldehyde hydrazones and N-monosubstituted hydrazones which are unreactive in previously reported hydrazone perfluoroalkylation reactions now take part in the reaction under our reaction conditions to give satisfactory yield of products. Stern-Volmer quenching studies and spin-trapping experiments indicated that these reactions proceed by free radical addition of
Visible-light-promoted organic dye catalyzed perfluoroalkylation of hydrazones under mild conditions
作者:Ming-Dong Zhou、Zhen Peng、Lei Li、He Wang
DOI:10.1016/j.tetlet.2019.151124
日期:2019.10
A general and facile visible-light-promoted organic dye catalyzed perfluoroalkylation of hydrazones has been developed using inexpensive and non-toxic Eosin Y as the photoredox catalyst under mild conditions. This reaction protocol exhibits synthetic simplicity, broad scope of substrates, and excellent functional group compatibility. A gram scale synthesis can be also facilitated with a satisfactory
The electrochemical thiocyanation/cyclization of aldehyde hydrazones was developed under external oxidant‐free and catalyst‐free conditions. In contrast to previous thiocyanation, this electrosynthetic approach enabled a cascade C—H thiocyanation/cyclization through a mild, direct electrolysis manner in an undivided cell without the additive of halogens and stoichiometric oxidants. In this protocol
The electrochemical phosphorylation of aldehyde hydrazones has been developed under exogenous oxidant-free conditions. The strategy provides expedient access to highly functionalized α-iminophosphine oxides with ample scope and broad functional group tolerance by means of mild, user-friendly electrolysis, in an undivided cell.
An ammonium persulfate mediated thiocyanation reaction of aldehyde‐derived hydrazones that affords 5‐thioxo‐1,2,4‐triazoliuminnersalts has been developed. The operational simplicity, mild and metal‐free reaction conditions performed at ambient temperature, wide functional group tolerance, and scalability of the process are key features of this method.