Microwave-assisted processes acylation

Indium triiodide catalyzes transesterification processes, e.g. the acylation of alcohols or amines and the conversion of THP ethers to acetates (Scheme 8.143) [187]. Indium triflate is also an efficient catalyst for the acylation of alcohols and amines (Scheme 8.144) [188]. Carboxylates are hydrolyzed to the corresponding carboxylic acids in high yield by microwave-assisted reaction on the surface of moistened silica gel in the presence of indium triiodide (Scheme 8.145) [189]. 

The microwave-induced N3-acylation of the dihydropyrimidine (DHPM) Bigi-nelli scaffold using different anhydrides has been discussed in a comprehensive report [130] (Scheme 16.85). The process included purification of the reaction mixture by means of a microwave-assisted scavenging technique. Several scavenging reagents with different loadings of amino functionalities have been used to sequester excess benzoic anhydride (BZ2O) from the reaction mixture [130, 139, 140]. 

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