N-acylpyrroles were synthesized via olefin ring-closingmetathesis of diallylamines and in situ oxidative aromatization in the presence of the ruthenium Grubbs catalyst and a suitable copper catalyst. In the presence of Cu(OTf)2 and CuBr2, the reaction afforded N-sulfonyl- and N-acylpyrroles, respectively, in one pot. Under an oxygen atmosphere, the reaction went smoothly without the need of hydroperoxide
A microwave-assisted synthesis of solid-supported reagents for the acylation of amines has been developed, and the same methodology has been successfully applied to the preparation of acylating agents anchored on different solid supports. Similarly, alcohols, phenols, and thiophenols have been easily acylated using these reagents under microwave irradiation.
Hydrosilylation of nitriles and tertiary amides using a zinc precursor
作者:Ravi Kumar、Rohan Kumar Meher、Himadri Karmakar、Tarun K. Panda
DOI:10.1039/d4ob00161c
日期:2024.4.17
We report a competent and selective hydrosilylation of nitriles and tertiary amides catalyzed by the readily available zinc bis(hexamethyldisilazide) under solvent-free and mild conditions, making it a sustainable and desirable alternative to existing methods. Both protocols afforded high conversion, superior selectivity, and a broad substrate scope, from electron-withdrawing to electron-donating and
even with challenging polar products. The performance of these scavengers is compared and contrasted with other known techniques, such as silica gel filtration and the use of self‐scavenging catalysts. As a result, a new hybrid purification method is devised, which gives better results than using either a self‐scavenging catalyst or a scavenger alone. Additionally, isocyanide II is shown to be a deactivating
A sustainable protocol of olefinmetathesis in non-degassed, undistilled ethyl acetate under air with commercially available self-scavenging ruthenium catalysts is described. Furthermore, a time economical, cost-effective and scalable method of removal of ruthenium residues is presented. Treatment of post-reaction mixtures with an isocyanidescavenger and then with acid followed by a simple filtration