Solvent-free synthesis of N-sulfonyl imines using WCl6 as a novel, highly efficient and reusable catalyst
作者:Mohammad Ali Zolfigol、Mahsa Tavasoli、Ahmad Reza Moosavi-Zare、Parastoo Arghavani-Hadi、Abdolkarim Zare、Vahid Khakyzadeh
DOI:10.1039/c3ra40681d
日期:——
WCl6 was used as a novel, efficient and reusablecatalyst for the preparation of N-sulfonyl imines via the condensation of sulfonamides with aldehydes as well as isatin under solvent-free conditions. The turn-over frequency (TOF) value of the catalyst is several times higher than the previously reported catalysts. Clean reaction, simple purification, short reaction time and high yield are some other
Introduction of functionalized C1, C2, and C3 units to imines was achieved by using the dimethylzinc-air-initiated alpha-alkoxyalkyl radical addition as a key reaction. The addition to a C= N double bond chemoselectively occurred in the presence of a C=O double bond, which is one of the advantages of this radical addition reaction over ionic addition reactions.
Unexpected reaction of a dimethylzinc-generated THF radical with aldehydes
A dimethylzinc-air-generated THF radical reacted with aldehydes at the beta-position of an alpha-oxygenated THE (C) 2003 Elsevier Ltd. All rights reserved.
Triarylmethyl chlorides as novel, efficient, and mild organic catalysts for the synthesis of <i>N</i>-sulfonyl imines under neutral conditions
A highly efficient procedure for the preparation of N-sulfonylimines via condensation of sulfonamides with aldehydes as well as ketones in the presence of triarylmethyl chlorides as metal-free organo-catalysts at 40 °C is described. The advantages of this class of catalysts over the reported ones are their efficiency and possibility of running reactions in neutral media that makes them suitable for
[reaction: see text] The product distribution of the three-component reaction of aldehydes, arylamines, and THF was dependent on a radical initiator, preferentially giving the corresponding THF adducts of imines with dimethylzinc and adducts of aldehyde with triethylborane.