Practical synthetic reactions using functionalized trimethylsilyldiazomethanes

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Application of functionalized trimethylsilyldiazomethanes to organic reactions was investigated in this work. It was found that an intermolecular [3+2]cycloaddition between functionalized trimethylsilyldiazomethanes and benzynes, in situ generated from (o-trimethylsilyl)aryl trifluoromethanesulfonates, efficiently afforded the corresponding 3-substituted indazoles. In addition, it was achieved that the synthesis of highly functionalized acylsilanes by oxidation of functionalized trimethylsilyldiazomethanes and the synthesis of 1-methyl-1-benzazepines from 1-methylquinolinium salts via ring expansion reactions. A new synthetic method of benzofurans from o-anisyl(oxo)acetates and diazo(trimethylsilyl)methylmagnesium bromide, a precursor for the preparation of functionalized trimethylsilyldiazomethanes, was also found.