The reactions of aminals, the Mannich bases, and azomethines derived from substituted salicylaldehydes were studied. Derivatives of tetrahydrocyclopenta[b]- and hexahydro-cyclohepta[b]chromenes and substituted 2,2'-spirobichromenes were prepared from aminals, and substituted hexahydroxanthenes were synthesized from the Mannich bases. Azomethine derivatives of 5-nitrosalicylaldehyde and aliphatic amines react with cyclohexanone to form 4a-amino-7-nitro-2,3,4,4a-tetrahydro-1H-xanthenes. 4a-Morpholino-7-nitro-9-phenylethynyl-1,2,3,4,9,9a-hexahydroxanthene was studied by X-ray diffraction analysis.
Metal- and Solvent-Free Multicomponent Decarboxylative A<sup>3</sup>-Coupling for the Synthesis of Propargylamines: Experimental, Computational, and Biological Investigations
作者:Pavneet Kaur、Bhupinder Kumar、Kamlesh K. Gurjar、Rohtash Kumar、Vinod Kumar、Rakesh Kumar
DOI:10.1021/acs.joc.9b02806
日期:2020.2.21
Decarboxylative A3-coupling of ortho-hydroxybenzaldehydes, secondary amines, and alkynoic acids is performed under catalyst and solvent-free conditions. The developed methodology provided a waste-free method for the synthesis of hydroxylated propargylamines which are versatile precursors for various bioactive heterocyclic scaffolds. The experimental and density functional theory studies revealed that
The use of potassium alkynyltrifluoroborates in Mannich reactions
作者:George W. Kabalka、Bollu Venkataiah、Gang Dong
DOI:10.1016/j.tetlet.2003.11.049
日期:2004.1
Potassium alkynyltrifluoroborates react with amines and salicylaldehydes in the presence of benzoic acid to generate highly functionalized amines. Ionic liquids such as butylmethylimidazolium tetrafluoroborate (BmimBF(4)) are suitable solvents for the reaction. (C) 2003 Elsevier Ltd. All rights reserved.