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• W2034694507 abstract "The object of this study is the interaction of the cyclic anhydride 2 of (18α,19β)-19-hydroxy-2,3-secooleanane-2,3,28-trioic acid 28,19-lactone (1) with primary and secondary amines. It was shown that the products of steric control (the corresponding 2-amino-2-oxo-3-oic acids=2-amides) were formed solely upon the opening of the anhydride cycle by secondary amines (Scheme 2), whereas the interaction with primary amines yielded a mixture of isomeric amides (Scheme 10). In the latter case, the solvent provided a noticeable effect on the reaction selectivity, which was demonstrated in the case of 4-methoxybenzylamine. The interaction between the resulting 3-amides and oxalyl chloride yielded the corresponding cyclic imides, whereas under these conditions, 2-amides formed spiropyrrolidinetriones (Scheme 4)." @default.
• W2034694507 created "2016-06-24" @default.
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• W2034694507 date "2013-09-01" @default.
• W2034694507 modified "2023-09-27" @default.
• W2034694507 title "Synthesis of Nitrogen-Containing Derivatives of (18α,19β)-19-Hydroxy-2,3-secooleanane-2,3,28-trioic Acid 28,19-Lactone" @default.
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• W2034694507 doi "https://doi.org/10.1002/hlca.201200492" @default.
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