Bulletin of the Chemical Society of Japan p. 1189 - 1190 (1980)
Update date:2022-08-05
Topics:
Tsuchida, Teruko
Koyama, Kikuhiko
Mitani, Michiharu
Takeuchi, Hiroshi
Ethyl azidoformate (1) reacts rapidly with morpholine to give morpholinium azide and 4-(ethoxycarbonyl)morpholine in good yields.With 4-methylmorpholine (3), however, the azide 1 reacts at 115 deg C with evolution of nitrogen to give formal nitrene-insertion products, 4-methyl-3-(ethoxycarbonylamino)morpholine and 4-(ethoxycarbonylaminomethyl)morpholine.There has not been found any product which might arise from the nitrene-insertion into C-H bond adjacent of oxygen of 3.These results can be accounted for on the basis of the n-donor abilities of heteroatoms, O and N.
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