Convenient synthesis of spirooxindoles using SnO2 nanoparticles as effective reusable catalyst at room temperature and study of their in vitro antimicrobial activity

Synthesis, characterization, and application of CoFe2O4@amino‐2‐naphthol‐4‐sulfonic acid as a novel and reusable catalyst for the synthesis of spirochromene derivatives

“…Briefly, in comparison with other nanocatalysts reported, the synthesized nanocatalyst has important advantages such as easy synthesis, high stability, reusability, and excellent yields of products along with short reaction time that make this method useful and attractive. Oudi et al [36] NH 4 Cl 20 mol% Water, 70 C 10 92 Dabiri et al [37] SnO 2 NPs 30 mg EtOH, r.t. 8 96 Moradi et al [38] Fe 3 O 4 /COS@β-CD-SO 3 H 20 mg H 2 O, 50 C 20 98 Mohammadian and Akhlaghinia [39] CoFe 2 O 4 @SiO 2 10 mg EtOH:H 2 O (1:1), 80 C 5 98 Hemmat et al [40] CoFe 2 O 4 @SiO 2 @SO 3 H 10 mg EtOH:H 2 O (1:1), 80 C 2 98 Zamani-Ranjbar-Garmroodi et al [41] ANSA…”

Engaging Isatins in Multicomponent Reactions (MCRs) – Easy Access to Structural Diversity

“…The authors compared this cheap and nontoxic catalyst with other catalysts already described in the literature for the synthesis of similar compounds and they found that when this catalyst was used, the reactions could be run at lower temperatures, with lower reaction times, giving better yields. The catalyst could be recycled up to five times without significant loss of catalytic efficacy [74] …”

“…NiFe 2 O 4 NPs [12] , [57] SnO 2 NPs [74] ZrO 2 NPs [98] NiO‐SiO 2 [125] NiO@g‐C 3 N 4 [126] ZnO nanodiscs [127] SrFe 12 O 19 MNPs [154] Cell‐CuI NPs [187]…”

Preparation of GO/SiO2/PEA as a new solid base catalyst for the green synthesis of some spirooxindole derivatives

“…Some of catalysts for synthesis of these compounds are include: piperidin 13 , Et 3 N, 14 MNPs-guanidne, 15 Na 2 CaP 2 O 7 , 16 L-proline, 17 meglumine, 18 SnO 2 (ref. 19) and CuO nanoparticles 20 and also 4dimethylaminopyridine. 21 In recent years, supported catalysts as green and reusable catalysts have received much attention in the design of chemical syntheses.…”

“…Some of catalysts for synthesis of these compounds are include: piperidin 13 , Et 3 N, 14 MNPs-guanidne, 15 Na 2 CaP 2 O 7 , 16 l -proline, 17 meglumine, 18 SnO 2 (ref. 19 ) and CuO nanoparticles 20 and also 4-dimethylaminopyridine. 21 …”