A regiospecific approach to N-alkylpyrazoles and the derived N-oxides using 5-endo-dig cyclisations of alkynyl nitrosamines.

[摘要]：5-Endo-dig cyclization of N-nitroso derivs. of homopropargylic amines, catalyzed by AgNO3 on SiO2 proceed smoothly at ambient temp. in chlorinated solvents to give essentially quant. yields of the corresponding pyrazole N-oxides, deoxygenation of which gives excellent yields of the related N-alkylpyrazoles in a regiospecific manner.

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