Reaction of beta-bromo alpha-alkylthiocinnamonitriles with various substituted methyl salicylates followed by treatment with AlCl3/PhNO2 provides 3-cyanoflavones. (C) 2003 Elsevier Ltd. All rights reserved.
Syntheses of 5-amino-3-aryl- and 3-amino-5-aryl-1H-pyrazoles from beta-bromo-alpha-(ethylsulfanyl)cinnamonitrile are described. The beta-bromo-alpha-(ethylsulfanyl) cinnamonitriles were oxidized with H(2)O(2) to the corresponding beta-bromo-alpha-(ethylsulfinyl) cinnamonitriles. Subsequent treatment of the resulting sulfoxides with hydrazine hydrate or methylhydrazine followed by hydrochloric acid hydrolysis afforded 5-amino-3-aryl- and 3-amino-5-aryl-1H-pyrazoles, respectively, in good yields.
A convenient access to 3-cyanoflavones
作者:Frédéric Lassagne、Francis Pochat
DOI:10.1016/j.tetlet.2003.10.072
日期:2003.12
Reaction of beta-bromo alpha-alkylthiocinnamonitriles with various substituted methyl salicylates followed by treatment with AlCl3/PhNO2 provides 3-cyanoflavones. (C) 2003 Elsevier Ltd. All rights reserved.
New Approach to 3‐Aminothiophene‐ 2‐carboxylic Acid Derivatives: Access to 5‐Aryl‐4‐(ethylsulfanyl) Compounds
Treatment of DMSO/water solutions of β‐bromo‐α‐(ethylsulfanyl)cinnamonitriles with sodium sulphide and α‐halo acetic acidsderivatives followed by cyclization in a potassium carbonate/acetone/DMSO mixture gave the expected 3‐amino‐5‐aryl‐4‐(ethylsulfanyl)thiophene‐2‐carboxylic acidsderivatives in fair yields.