simple and efficient method for the synthesis of 3‐oxopropanenitriles from variously substituted heterocyclic compounds via direct electrophilic cyanoacetylation is described. A series of heterocyclic 3‐oxopropanenitriles (2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i, 2j, 2k) have been synthesized using mixed anhydride (acetic or trifluoroaceticanhydride:cyanoacetic acid) in the presence of Mg(ClO4)2·2H2O as
[EN] OXIME ESTER PHOTOINITIATORS CONTAINING FIVE-MEMBERED HETEROAROMATIC RING STRUCTURE, AND PREPARATION AND USE THEREOF<br/>[FR] PHOTO-INITIATEURS À BASE D'ESTER D'OXIME CONTENANT UNE STRUCTURE CYCLIQUE HÉTÉROAROMATIQUE À CINQ CHAÎNONS, LEUR PRÉPARATION ET LEUR UTILISATION<br/>[ZH] 包含五元芳杂环结构的肟酯类光引发剂及其制备和用途
A convenient “one-pot” Friedel–Crafts reaction of mono-, bi- and tert-thiophenes with trifluoroacetic acid anhydride (TFAA) as an acylating agent and magnesium perchlorate dihydrate (anhydron) as catalyst affords trifluoroacetyl-substituted products in high yields. This method provides a novel approach for the synthesis of thiophene based derivatives bearing trifluoroacetyl group. The mechanism of this