Hochdruckversuche: Umsetzungen von kohlenstoffdisulfid mit aminen, amiden und olefinen—V
作者:J. Petermann、H. Plieninger
DOI:10.1016/0040-4020(75)85058-7
日期:1975.1
Suitable tertiary amines react with CS2, 100°C, 104 atm to give N,N-disubstituted thioformamides. Salts of dialkyldithiocarbamic acids decompose at the same conditions into dialkylthioformamide and sulphur. After addition of cyclohexene, mainly N,N-dialkyldithiocarbamic acid cyclohexyl ester has been obtained. Carbon disulfide and sulphur add to olefins yielding trithiocarbonates. Dimethyl formamide
secondary aliphatic amines with tetramethylthiuramdisulfide in various solvents at different temperatures was studied. At 110°C, the reactions with primary amines afforded mixed,N,N-dimethyl-N′-alkyl(cycloalkyl)thioureas and symmetricalN,N′-dialkyl(cycloalkyl)thioureas as the final products, while the reactions with secondary amines gave mixtures of dithiocarbamate salts with “symmetrical” derivatives
into the final products occur,viz., (1) the reactions of CS2 with primaryamines on heating (70–110 °C) yield mixed and symmetrical thioureas and the reactions of CS2 with secondaryamines give symmetrical dithiocarbamates, and (2) insertion of CS2 intoS-(thiocarbamoyl)thiohydroxylamines affords thiuram disulfides. Thiuram disulfides formed from primaryamines decompose to give isothiocyanates, which
Cu-mediated one-pot three-component synthesis of 3-N-substituted 1,4,2-benzodithiazine 1,1-dioxide derivatives
作者:Wei Dong、Zemei Ge、Xin Wang、Ridong Li、Runtao Li
DOI:10.1016/j.tet.2020.131354
日期:2020.7
A novel and efficient copper-catalyzed one-pot procedure for the synthesis of 3-N-substituted 1,4,2-benzodithiazine 1,1-dioxide derivatives from 2-halobenzenesulfonamides, amines and CS2 is described. The reaction proceeds through Ullmann-type S-arylation, intramolecular addition of NH2 with CS and dehydrosulfide, which provides a new and useful strategy for construction of cyclic aromatic sulfonamides
A catalyst-free 1,4-Michael-type reaction of in situ generated ortho-quinone methides (o-QMs) with dithiocarbamic acid salts in water
作者:Fezzeh Aryanasab、Meisam Shabanian
DOI:10.1007/s13738-019-01644-z
日期:2019.8
catalyst-free conjugate addition of dithiocarbamicacid salts to in situ generated ortho-quinone methides (o-QMs) was investigated for the first time. Several dithiocarbamate derivatives of 4-hydroxycoumarine, 4-hydroxypyrone and 2-naphthol were synthesized in moderate-to-good yields in water at room temperature. Graphical abstract Catalyst-free addition of dithiocarbamicacid salts to in situ generated o-QMs