Reactions of 1,1,4,4-tetramethylsemicarbazide with prop-2-ynyl bromide, allyl bromide, and 1,3-dibromoprop-1-yne
作者:V. N. Elokhina、A. S. Nakhmanovich、E. V. Abramova、L. I. Larina
DOI:10.1134/s1070428006100022
日期:2006.10
1, 1,4,4-Tetramethylsemicarbazide readily undergoes alkylation with prop-2-ynyl bromide and allyl bromide at the tertiary nitrogen atom of the hydrazine fragment to give 1-(prop-2-yn-1-yl)- and 1-(prop-2-en-1-yl) -1,1-dimethyl-2-(dimethylannocarbonyl)hydrazinium bromides, respectively. A new procedure was proposed for the synthesis of 6-bromomethylidene-2-dimethylamino-4,4-dimethyl-5,6-dihydro-4H-1,3,4-oxadiazin-4-ium bromide by reaction of 1, 1,4,4-tetramethylsemicarbazide with 1,3-dibromoprop-1-yne in acetonitrile.