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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Chemoselective calcium-catalyzed direct amidation of carboxylic esters》. Authors are Nguyen, D. Thao; Lenstra, Danny C.; Mecinovic, Jasmin.The article about the compound:Methyl tetrahydrofuran-2-carboxylatecas:37443-42-8,SMILESS:O=C(C1OCCC1)OC).Quality Control of Methyl tetrahydrofuran-2-carboxylate. Through the article, more information about this compound (cas:37443-42-8) is conveyed.

Unactivated carboxylic esters and primary amines undergo calcium-catalyzed direct amide bond formation to afford amides I [R1 = n-Pr, Ph, 4-hydroxybutyl, etc.; R2 = 2-thienyl, Ph, Bn, etc.] in excellent yields under homogeneous conditions in toluene. This green and mild reaction proceeds chemoselectively with esters, whereas related carboxylic acids and amides remain unreactive.

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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics