1-Aroyl-2,2-dimcthylhydrazines react with propargyl and allyl bromides to form, respectively, 1,1-dimethyl-1-(2-propyn-1-yl)- and 1,1-dimethyl-1-(2-propen-1-yl)-2-aroylhydrazinium bromides. Treatment of these compounds with an NaOH solution yielded, respectively, N-[dimethyl(2-propyn-1-yl)ammonio]- and N-[dimethyl(2-propen-1-yl)ammonio]aroylimides.1-Aroyl-2,2-dimethylhydrazines react with propargyl and allyl bromides to form, respectively, 1,1-dimethyl-1-(2-propyn-1-yl)- and 1,1-dimethyl-]-(2-propen-1-yl)-2-aroylhydrazinium bromides. Treatment of these compounds with an NaOH solution yielded, respectively, N-[dimethyl(2-propyn-1-yl)ammonio]- and N-[dimethyl(2-propen-1-yl)ammonio]aroylimides.
Synthesis of 1,3,4-Oxadiazinium Bromides from 1,1-Dimethylhydrazine Derivatives and 1,3-Dibromopropyne
作者:A. S. Nakhmanovich、V. N. Elokhina、L. I. Larina、E. V. Abramova、V. A. Lopyrev
DOI:10.1007/s11176-005-0246-6
日期:2005.3
2-Aryl(heteryl, dimethylamino)-6-bromomethylidene-4,4-dimethyl-5H-1,3,4-oxadiazinium bromides were prepared in good yields by the reactions of 1-aroyl(heteroyl)-2,2-dimethylhydrazines and 1,1,4,4-tetramethylsemicarbazide with 1,3-dibromopropyne in MeOH or MeCN at 20–50°C.
Herein, direct N,N-dialkylation of acylhydrazides using alcohols is reported. This catalytic protocol provides one-pot synthesis of both symmetrical and unsymmetrical N,N-disubstituted acylhydrazides using an assortment of primary and secondary alcohols with remarkable selectivity and excellent yields. Interestingly, the use of diols resulted in intermolecular cyclization of acylhydrazides, and such
作者:R. V. Karnaukhova、T. V. Nizovtseva、A. S. Nakhmanovich、A. I. Albanov、T. N. Komarova
DOI:10.1023/a:1015028806581
日期:——
Reactions of 1-aroyl-2,2-dimethylhydrazines with 1,3-dibromopropyne in MCOH or MeCN at 20-50 degreesC yield 2-aryl-6-bromomethylidene-4,4-dimethyl-5H-1,3,4-oxadiazinium bromides.
Reactions of hydrazines with esters and carboxylic acids
作者:Richard Frederick Smith、Alvin C. Bates、Angello J. Battisti、Peter G. Byrnes、Christine T. Mroz、Thomas J. Smearing、Frederick X. Albrecht