- Multicomponent heterocyclization of carboxamides with H2S and CH2O
-
Multicomponent heterocyclization of aliphatic amides with H2S and CH2O (1:3:2) in water-organic solvent mixture in the presence of BuONa led to the formation of 1,3,5-dithiazinane in high yield (30-95%) and with high selectivity (100%). Under these conditions benzamide gave 3,5-dibenzoyl-1,3,5-thiadiazinane in 74% yield, whereas due to ortho-effect the acetylsalicylamide with H2S and CH2O in a system BuOH-H2O without BuONa formed N-acetylsalicyloyl-1,3,5-dithiazinane (80%). Heterocyclization of α-aminosuccinic acid monoamide depending on the H2S and CH2O concentration occurred either at one or both NH2 yielding respectively mono-or bisdithiazinanes.
- Akhmetova,Khairullina,Nadyrgulova,Kunakova,Dzhemilev
-
p. 190 - 196
(2008/12/20)
-
- Cyclothiomethylation of aryl hydrazines with formaldehyde and hydrogen sulfide
-
Cyclothiomethylation of phenyl hydrazine with CH2O and H 2S in a ratio of 1: 3: 2 in an acidic medium (HCl) afforded previously unknown 3-phenyl-1,3,4-thiadiazolidine (35% yield) and N-phenyl(perhydro-1,3,5-dithiazin-5-yl)amine (35%
- Akhmetova,Nadyrgulova,Tyumkina,Starikova,Golovanov,Antipin,Kunakova,Dzhemilev
-
p. 1824 - 1834
(2007/10/03)
-
- DARSTELLUNG UND EIGENSCHAFTEN VON SCHWEFELHALTIGEN SIEBENRINGEN 2. 1,2,4,6-TETRATHIEPAN
-
Dilution of the yellow solution of polymeric thioform aldehyde in concentrated sulfuric acid with water leads to a mixture of compounds, which contains besides s-trithiane and an oxygen containing polymeric thioether some five to ten percent of 1,2,4,6-tetrathiepane.The properties of this compound are described.This reaction is an example for the conversion of polymer into cyclic thioethers.
- Weissflog, Eckhard
-
p. 157 - 160
(2007/10/02)
-