A new reaction of α-chloro-α-chlorosulfenyl ketones: facile syntheses of 3,3-dichloro- and 3-chloro-chroman-4-ones and thiochroman-4-ones
作者:Christopher D. Gabbutt、John D. Hepworth、B. Mark Heron
DOI:10.1016/s0040-4020(01)90434-x
日期:1994.4
Gabbutt Christopher D., Hepworth John D., Heron B. Mark, Kanjia Magan, Tetrahedron, 50 (1994) N 3, S 827-834
作者:Gabbutt Christopher D., Hepworth John D., Heron B. Mark, Kanjia Magan
DOI:——
日期:——
New Reactions with Thiosulfines/Dithiiranes: Cycloadditions Leading to Dispiro Derivatives of 1,2,4-Trithiolane.
作者:Mohamed I. Hegab、Farouk M. E. Abdel-Megeid、Farouk A. Gad、Sayed A. Shiba、Inger Søtofte、Jørgen Møller、Alexander Senning、Xin-Kan Yao、Hong-Gen Wang、J. -P. Tuchagues、Mattias Ögren
DOI:10.3891/acta.chem.scand.53-0133
日期:——
The beta-oxo thiosulfines 8, generated by 'unzipping' of the corresponding acetyl alpha-chloroalkyl disulfides 11 with morpholine, are partially converted into the corresponding thioketones 12 which then cycloadd to 8 to give the observed cis-and trans-1,2,4-trithiolanes 15. The unsymmetrical Diels-Alder dimerization of 12 plays only a minor role. The new heterocycles thus obtained have been characterized spectroscopically and by X-ray crystallography.
Ring contraction of sulfenamides derived from thiochroman-4-ones
作者:Christopher D. Gabbutt、John D. Hepworth、B.Mark Heron、Magan Kanjia
DOI:10.1016/s0040-4020(01)80797-3
日期:1994.1
chroman-4-ones react with an excess of thionyl chloride to give the α-chlorosulfenyl chlorides (2) which form sulfenamides (3) when treated with secondary amines. On hydrolysis, (3) undergo a ringcontraction to give benzo[b]thiophen-3-ones (4).
噻苯并吡喃-4-酮和苯并吡喃-4-酮与过量的亚硫酰氯反应生成α-氯亚磺酰氯(2),当用仲胺处理时,形成亚磺酰胺(3)。水解时,(3)发生环收缩,得到苯并[ b ]噻吩-3-酮(4)。