The author of 《Synthesis and Properties of Ethyl [(Adamantan-1-yl)alkylene(phenylene)amino]oxoacetates and N1,N2-Bis[(adamantan-1-yl)alkylene(phenylene)]oxamides》 were D’yachenko, V. S.; Burmistrov, V. V.; Butov, G. M.. And the article was published in Russian Journal of Organic Chemistry in 2019. Electric Literature of C4H5ClO3 The author mentioned the following in the article:
Et [(adamantan-1-yl)alkylene(phenylene)amino]oxoacetates I (X = CH2, CHCH3, benzen-1,4-diyl) and Et ([2-(adamantan-2-yl)pentyl]amino)oxoacetate and N1,N2-bis[(adamantan-1-yl)-alkylene(phenylene)]oxamides II (R = CH2, (CH2)2, benzen-1,4-diyl) were prepared in yields of 72-87 and 18-60%, resp., by the reaction of amines of the adamantane series (adamantan-1-yl)methylamine, 4-(adamantan-1-yl)phenylamine, 2-(adamantan-2-yl)pentylamine, etc. with Et chlorooxoacetate/oxalyl chloride in methylene chloride in mild conditions. In the part of experimental materials, we found many familiar compounds, such as Ethyl oxalyl monochloride(cas: 4755-77-5Electric Literature of C4H5ClO3)
Ethyl oxalyl monochloride(cas: 4755-77-5) belongs to acyl chlorides. In the laboratory, acyl chlorides are generally prepared by treating carboxylic acids with thionyl chloride (SOCl2). The reaction is catalyzed by dimethylformamide and other additives.Electric Literature of C4H5ClO3
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics