2‐Arylation/alkylation of benzothiazoles using superparamagneticgraphene oxide‐Fe₃O₄ hybrid material as a heterogeneous catalystwith diisopropyl azodicarboxylate (DIAD) as an oxidant

Abstract

In this report, we introduced Graphene oxide‐iron oxide (GO‐Fe3O4) nanocomposites as a heterogeneous catalyst for arylation/alkylation of benzothiazoles with aldehydes and benzylic alcohols in the presence of diisopropyl azodicarboxylate (DIAD) as an oxidant which exclusively produced 2‐aryl (alkyl)‐1H–benzothizoles in moderate to excellent yields. The absence of precious metals and toxic solvent, easy product isolation, and recyclability of the GO‐Fe3O4 with no loss of activity are notable advantages of this method.

Direct Oxygenation of C–H Bonds through Photoredox and Palladium Catalysis

“…1 H NMR (400 MHz, CDCl 3 ) δ 8.12–8.00 (m, 2H), 7.93 (d, J = 7.9 Hz, 1H), 7.49 (t, J = 7.7 Hz, 1H), 7.37 (t, J = 7.5 Hz, 1H), 7.03 (d, J = 3.0 Hz, 2H), 4.02 (s, 3H), 3.91 (s, 3H); 13 C­{ 1 H} NMR (126 MHz, CDCl 3 ) δ 165.3, 162.9, 153.99, 151.92, 150.6, 149.0, 143.2, 136.2, 133.5, 126.3, 125.9, 124.9, 124.6, 122.8, 121.5, 121.2, 121.0, 118.8, 115.1, 113.5, 112.7, 99.5, 56.4, 56.0. Spectral data matched with the literature report …”

“…3e was obtained as a white solid (667 mg, 82%). 45 2-(3-Iodophenyl)benzo [d]thiazole (3i). Compound 3i was prepared as per the reaction condition to synthesize 2-arylbenzothiazoles (iv).…”

Impregnated copper ferrite on mesoporous graphitic carbon nitride: An efficient and reusable catalyst for promoting ligand‐free click synthesis of diverse 1,2,3‐triazoles and tetrazoles

“…In our quest to develop aqueous medium organic synthesis of triazoles, we employed CuFe 2 O 4 /g‐C 3 N 4 hybrids as a catalyst in the click reaction of phenylacetylene 1a (1.1 mmol), benzyl bromide 2a (1.2 mmol), and sodium azide (1.2 mmol) in H 2 O without using any reducing agent (Table ).…”