Merzhyievskyi, Danylo O.; Shablykin, Oleh V.; Shablykina, Olga V.; Kozytskiy, Andriy V.; Rusanov, Eduard B.; Moskvina, Viktoriia S.; Brovarets, Volodymyr S. published an article in 2021. The article was titled 《Functionalized 5-Amino-4-cyanoxazoles, their Hetero- and Macrocyclic Derivatives: Preparation and Synthetic Applications》, and you may find the article in European Journal of Organic Chemistry.Category: esters-buliding-blocks The information in the text is summarized as follows:
An approach to a series of new 5-amino-4-cyanoxazoles is described. Synthesis of the title compounds relied on a two-step sequence including heterocyclization of 2-amido-3,3-dichloroacrylonitriles with aliphatic secondary amines (dimethylamine, morpholine), primary aliphatic amines with active functional groups (2-aminoethanol and glycine Et ester), and aniline. An efficient and straightforward protocol introduces a carboxylate group at the C-2 position of 5-amino-4-cyanoxazoles, connected to the heterocycle directly or through an aliphatic linker. This carboxylic group is an attractive motif that can be found in a variety of drug-relevant compounds and also used for further modifications. Furthermore, efficient transformations of selected trisubstituted compounds were used to demonstrate their rich synthetic potential – e. g., as precursors to 2-(4-cyano-5-(dimethylamino)oxazol-2-yl)acetamides, oxazole-containing macrocyclic structures, 2-(oxazol-2-yl)acetamides, amino pyrazoles, 3-(4-cyano-5-aminoxazol-2-yl)coumarins, and oxazole amino acids. In the part of experimental materials, we found many familiar compounds, such as Ethyl oxalyl monochloride(cas: 4755-77-5Category: esters-buliding-blocks)
Ethyl oxalyl monochloride(cas: 4755-77-5) belongs to acyl chlorides. Lacking the ability to form hydrogen bonds, acyl chlorides have lower boiling and melting points than similar carboxylic acids. For example, acetic acid boils at 118 °C, whereas acetyl chloride boils at 51 °C. Like most carbonyl compounds, infrared spectroscopy reveals a band near 1750 cm−1.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics