Eckert, Kaitlyn E. published the artcileAroyl Isocyanates as 1,4-Dipoles in a Formal [4 + 1]-Cycloaddition Approach toward Oxazolone Construction, Application of 2,4-Dichlorobenzamide, the publication is Organic Letters (2018), 20(8), 2315-2319, database is CAplus and MEDLINE.
A formal phosphine-mediated [4 + 1]-cycloaddition between a 1,2-dicarbonyl and an aroyl isocyanate to provide oxazolones I (Ar1 = Ph, 4-MeOC6H4, 4-BrC6H4, etc.; Ar2 = Ph, 4-FC6H4, etc.) bearing a disubstituted C5 center is described. By exploiting the carbene-like reactivity of oxyphosphonium enolates as C1 synthons and aroyl isocyanates as formal 1,4-dipoles, oxazolones and spiroooxindole oxazolones II (Ar1 = Ph, 4-MeOC6H4, 4-BrC6H4; R1 = H, 5-Me, 5-Br, etc.; R2 = Me, Ac, Boc, Bn, etc.) are constructed in high yields (39-99%).
Organic Letters published new progress about 2447-79-2. 2447-79-2 belongs to amides-buliding-blocks, auxiliary class Chloride,Amine,Benzene,Amide, name is 2,4-Dichlorobenzamide, and the molecular formula is C7H5Cl2NO, Application of 2,4-Dichlorobenzamide.
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