Synthesis of 2-iminothiazolidin-4-ones using guanine functionalized SBA-16 as a solid base catalyst

Cucurbit[6]uril-Supported Fe3O4 Magnetic Nanoparticles Catalyzed Green and Sustainable Synthesis of 2-Substituted Benzimidazoles via Acceptorless Dehydrogenative Coupling

“…In order to circumvent the inherited drawbacks associated with homogeneous catalysts, the design and development of economic, green, and sustainable heterogeneous catalysts is of prime importance. 32 − 34 …”

“…Though these metal-based catalysts were efficient, they suffered from several drawbacks, such as the use of expensive ligands, low thermal stability, high catalyst loading, use of toxic organic solvents, recyclability of the catalyst, and so forth. In order to circumvent the inherited drawbacks associated with homogeneous catalysts, the design and development of economic, green, and sustainable heterogeneous catalysts is of prime importance. − …”

Visible-light-driven three-component annulation for the synthesis of highly functionalized 2-iminothiazolidin-4-ones without photocatalysts

“…26 Subsequently, Pathak and co-workers developed a guanine functionalized SBA-16 catalyzed three-component annulation approach for the synthesis of 2-iminothiazolidin-4-ones from aromatic/aliphatic amines, aryl isothiocyanates, and ethyl bromoacetate. 27 Meshram and co-workers also explored a DABCO-catalyzed four-component reaction for the synthesis of ( Z )-5-(3-hydroxy-2-oxoindolin-3-yl)-2-iminothiazolidin-4-ones. 28 In addition, we discovered a cyclization strategy to deliver 2-iminothiazolidin-4-ones from amines, isothiocyanates and alkyl acetylenedicarboxylates in the absence of any metals, photocatalysts and bases (Scheme 1(b)).…”