Liquid crystalline cyclic tetramethyltetrasiloxanes containing coumarin moietiesElectronic supplementary information (ESI) available: characterisation data; textures of CS1 and CS8; table of layer spacings. See http://www.rsc.org/suppdata/jm/b3/b302857g/
One-Pot Synthesis of 5-Alkylthio-3H-1,2-dithiole-3-thiones: Advantages and Scopes
作者:Mario L. Aimar、Rita H. de Rossi
DOI:10.1055/s-2000-8202
日期:——
The reaction of dialkyl malonate esters with P 2S5/S8 in boiling xylene in the presence of 2-mercaptobenzothiazole/ZnO as catalyst produces 5-alkylthio-3 H-1,2-dithiole-3-thiones as major identifiable product. Moderate yields were obtained with malonate esters of primary alcohols. The reaction fails with malonate esters of secondary alcohols. Regarding the substituent in position two, di- alkyl malonates
Bis(hydroxymethylation) of the Active Methylene Group of 1,3-Dicarbonyl and Related Compounds
作者:Andrei Guzaev、Harri Lönnberg
DOI:10.1055/s-1997-1344
日期:1997.11
Treatment of dialkyl and di(aralkyl) malonates, alkyl cyano- and acetoacetates, and 1,3-diketones with formaldehyde in the presence of tertiary amines gives their 2,2-bis(hydroxymethyl) derivatives in 59 to 96% yield.
Synthesis of Branched Chain 2-Deoxyoct-3-Ulosonic Acid Derivatives as Precursors for C-Nucleoside Analogues
作者:Roland Meisel、Klaus Peseke、Helmut Reinke
DOI:10.1080/07328309808001884
日期:1998.9.1
Abstract Reaction of 2,3,4,5,6-penta-O-acetyl-D-galactonic 1 and D-gluconic acid chloride 2, respectively, with derivatives of malonic acid furnished substituted 2-deoxyoct-3-ulosonic acid esters, amides, and nitriles. Further modification was carried out by O-acylation and halogenation.
New 5-hydroxy-2-furanone compounds have anti-inflammatory, immunosuppressive and anti-proliferative activity and are useful in treating psoriasis and modifying calcium homeostasis.