Considering their growing attention in the field of medicinal chemistry and drug-discovery research, the facile and convenient approaches towards the preparation of 2-aryl benzoxazole derivatives have been described. The transformation is accomplished by using Fe(III)-catalyzed C–H activation of benzoxazoles with boronic acids to obtain a wide range of C2-arylated benzoxazoles in high yields. The developed
Cyclization of α-Oxo-oximes to 2-Substituted Benzoxazoles
作者:Alan R. Katritzky、Zuoquan Wang、C. Dennis Hall、Novruz G. Akhmedov、Aleksandr A. Shestopalov、Peter J. Steel
DOI:10.1021/jo026771y
日期:2003.11.1
Reactions of oximes 9, 17, and 19 with electrophiles 15a-f and 24 in the presence of anhydrous potassium carbonate or triethylamine give 2-substituted condensed ring oxazoles 10, 16a-c, 18a-d, 20a-c, and 25 in a new general route to these compounds.
1,3-Dipolar cycloaddition of nitrosonaphthols to 3-aroylazindines. Novel syntheses of substituted naphtho[1,2-<i>d</i>]oxazoles and naphtho[2,1-<i>d</i>]oxazoles
作者:J. W. Lown、J. P. Moser
DOI:10.1139/v70-371
日期:1970.7.15
A series of 3-aroyl-2-arylaziridines underwent 1,3-dipolar cycloadditions in both orientations to the nitrogen–oxygen bond of 1-nitroso-2-naphthol. Spontaneous 1,3-cleavage of the intermediate oxadiazolidines to nitrones and cyclodehydration of the latter afforded both 2-aryl- and 2-aroylnaphtho-[1,2-d]oxazoles in good yields. The interpretation of the reaction received confirmation by independent