Quaternary pilocarpine derivatives as potential acetylcholine antagonists. 2. Alterations in the lactone and imidazole moieties
作者:Avraham A. Ben-Bassat、David Lavie、Habib Edery、Gila Porath
DOI:10.1021/jm00229a014
日期:1976.7
chemical behavior of pilocarpine, as well as the factors which determine its pharmacological activity, systematic and specific structural changes involving the lactone and imidazole moieties have been performed. Series of model compounds with cyclic or open-chain structures and a variety of N-3 bonded chains obtained from previously prepared anticholinergic derivatives of pilocarpine have been synthesized
Silver-mediated radical cyclization: construction of Δ2-isoxazolines from α-halo ketoximes and 1,3-dicarbonyl compounds
作者:Yan-Yun Liu、Xu-Heng Yang、Ji Yang、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/c4cc02084g
日期:——
A novel route to Delta(2)-isoxazolines is presented via silver-mediated radical cyclization of alpha-halo ketoximes with 1,3-dicarbonyl compounds. This method is performed using a radical strategy, and represents a new example of silver-initiated generation of oxime radicals for the formation of the C(sp(3))-O bonds.
Reactions of Monohalomethyl Aryl Ketoximes with Tetrasulfur Tetranitride: Much Improved Synthesis of 3-Aryl-1,2,5-thiadiazoles
作者:Kyongtae Kim、Jaeeock Cho
DOI:10.3987/com-94-6755
日期:——
Reactions of chloromethyl aryl ketoximes (1, X = Cl) with tetrasulfur tetranitride in p-dioxane at reflux for 4 h afforded 3-aryl-1,2,5-thiadiazoles (2) in 37-92% yields, whereas those of bromo analogs under the same conditions gave 2 and 3-aryl-4-bromo-1,2,5-thiadiazoles (3) in 48-81% and 17-31% yields, respectively. However, the compounds (3) were not formed in the presence of pyridine. Alpha-nitrosostyrene and its ring-substituted derivatives (4) are proposed as intermediates for the formations of 2.