The reactions of 2-(2-cyanoethyl)-1,1-dimethylhydrazine with prop-2-ynyl bromide, 1,3-dibromopropyne, and allyl bromide involve alkylation by a tertiary nitrogen atom to form 2-(2-cyanoethyl)-1,1-dimethyl-1-(prop-2-ynyl)-, 1-(3-bromoprop-1-ynyl)-2-(2-cyanoethyl)-1,1-dimethyl-, and 1-allyl-2-(2-cyanoethyl)-1,1-dimethylhydrazinium bromides.
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.
Rhodium-Catalyzed Intramolecular [4 + 2] Cycloadditions of Alkynyl Halides
作者:Woo-Jin Yoo、Anna Allen、Karine Villeneuve、William Tam
DOI:10.1021/ol052412o
日期:2005.12.1
[reaction: see text] Cationic rhodium(I)-catalyzed intramolecular [4 + 2] cycloadditions of diene-tethered alkynylhalides were found to occur in good yields (70-87%). The halide moiety is compatible with the cycloaddition reactions, and no oxidative insertion to the alkynylhalide was observed. The halogen-containing cycloadducts could be transformed into a variety of products that are difficult or
Quinoxaline-2,3-dithiol in reactions with propargyl bromide and 1,3-dibromopropyne
作者:T. I. Yaroshenko、V. N. Elokhina、A. S. Nakhmanovich、L. I. Larina、T. N. Komarova、S. V. Amosova
DOI:10.1134/s1070363209060280
日期:2009.6
obtained by crystallization of this mixture from ether. The reaction of 1,3-dibromopropyne with quinoxaline-2,3-dithiol in ethanol in the presence of NaOH at heating results in 2-bromomethylidene-1,4-(3H)-dithiino[2,3-b]quinoxaline in 77% yield. Performing this reaction in methanol in the presence of sodium methoxide during long heating (16 h) led to 2,3-bis[(3-bromo-2-propynyl)sulfanyl]quinoxaline in 72%
在K 2 CO 3存在下,将丙炔溴化物与喹喔啉-2,3-二硫醇在DMSO中以高收率获得2,3-双-(2-丙炔基硫烷基)喹喔啉,而在无水甲醇中于20°C存在甲醇形成2,3-双(2-丙炔基硫烷基)喹喔啉和3-(2-丙炔基硫烷基)-2(1H)-喹喔啉硫酮的1∶2混合物。通过从乙醚中结晶该混合物,得到单独的3-(2-丙炔基硫烷基)-2(1H)-喹喔啉硫酮。1,3-二溴丙炔与喹喔啉-2,3-二硫醇在乙醇中在氢氧化钠存在下加热反应,生成2-溴亚甲基-1,4-(3 H)-二硫代[2,3- b]喹喔啉,收率为77%。在甲醇中,在甲醇钠的存在下,长时间加热(16 h)进行该反应,以72%的收率得到2,3-双[(3-溴-2-丙炔基)硫烷基]喹喔啉。
New synthesis of trifluorinated amines from 1-bromopropargylic amines in superacid
Treatment of 1-bromopropargylic amines affords the corresponding 1,1,1-trifluoro in one step in HF–SbF5 medium. 1-Bromo-1,1-difluoro or 2-bromo-1,1,1-trifluoro derivatives could also be prepared, depending on the reaction conditions.
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.