A new synthesis of 1-substituted-1H-indazoles via 1,3-dipolar cycloaddition of nitrile imines to benzyne is described. The reaction is completed within 5 min, affording the corresponding N(1)-C(3) disubstituted indazoles in moderate to excellent yields.

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A silver-mediated one-step procedure to 2,4-disubstituted and 2,4,5-trisubstituted oxazoles has been developed. The method is complementary to existing technologies, yet provides advantages with regard to simplicity, efficiency, and performance. The silver product can be readily recycled, thus minimizing waste.

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