Attack of alkyl Grignard reagents on 4-substituted 1,2,3-benzotriazines occurs at N-2; ethylmagnesium iodide attacks at N-2 of 3-methyl-1,2,3-benzotriazin-4(3H)-one whereas methylmagnesium iodide adds at C-4 to give, after dehydration, 3,4-dihydro-4-methylene-3-methyl-1,2,3-benzotriazine.
J. J. A. Campbell, S. J. Noyce and R. C. Storr, J. Chem. Soc., Chem. Commun., 1983, 1344 DOI: 10.1039/C39830001344
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