triazolochromenes were formed with complete regioselectivity and new biologically relevant structures were synthesized via extension of the developed procedure and via postfunctionalization. The mechanochemical synthesis was carried out for several salicylaldehydes and gave a clear improvement in the yield of the corresponding triazolochromenes and consequently showed to be a viable alternative for solid salicylaldehydes
Facile access to 2-aryl-3-nitro-2H-chromenes and 2,3,4-trisubstituted chromanes
作者:Ping-An Wang、Dong-Xu Zhang、Xue-Ying Liu
DOI:10.3998/ark.5550190.p008.801
日期:——
materials, 2-aryl-3-nitro-2H-chromenes were prepared in good yields (up to 83%) through the combination of 30 mol% of pyrrolidine- benzoic acid catalyzed tandem oxa-Michael-Henry reactions in refluxing ethanol. Additionally, the Michael reactions of 2-aryl-3-nitro-2H-chromenes with acetone were also performed by the same catalytic combination in brine to give 2,3,4-trisubstitutedchromanes up to 86%
Green Synthesis of Spirooxindole-pyrrolidine/Piperidine Fused Nitrochromane: One Pot Three Component Stereo and Regioselective Cycloaddition
作者:Sabita Nayak、Sambita K. Mishra、Sujitlal Bhakta、Pravati Panda、Nilofar Baral、Seetaram Mohapatra、Chandra S. Purohit、Pardhasaradhi Satha
DOI:10.2174/1570178612666151030213735
日期:2015.12.2
spirooxindolepyrrolidine/ piperidine fused nitrochromanes via onepot three component 1,3-dipolar cycloaddition reaction in nontoxic solvent in a shorter time. It offers several advantages such as regio/stereoselective synthesis of spirooxindolepyrrolidine/ piperidine fused nitrochromanes, shorter reaction time, mild reaction conditions, simple and environmentallyfriendly operational procedure.
for the synthesis of spiro indanone pyrrolidine/piperidine fused nitrochromene derivatives is described. The synthesis of a new series of spirocyclic molecules has been expediently accomplished via a one‐pot, three component 1,3‐dipolar cycloaddition reaction. 2‐Phenyl‐nitrochromene dipolarophiles were reacted with azomethine ylides, generated in situ by the condensation of dicarbonyl compound indane‐1
Microwave‐assisted rapid and efficient synthesis of chromene‐fused pyrrole derivatives through multicomponent reaction and evaluation of antibacterial activity with molecular docking investigation
current study aimed to identify a new strategy of FeCl3 catalyzed multicomponent synthesis of substituted2H‐chromene–fused pyrrole derivatives. A series of chromene‐based pyrrole prepared by employing an array of 3‐nitro‐2H‐chromenes, aniline, and acetylacetone in toluene under microwave irradiation. Using FeCl3 as a prompt catalyst and microwave irradiation to synthesize 2H‐chromene–fused pyrrole motifs