Synthesis of 5-polyfluoroalkyl-4-(p-tolyl-sulfonyl)pyrazoles and 4-polyfluoroalkyl-5-(p-tolylsulfonyl)pyrimidines from 1-dimethylamino-2-(p-tolylsulfonyl)-polyfluoro-1-alken-3-ones

Silver-Catalyzed Synthesis of 5-Amino-4-sulfonyl Pyrazoles from 1,2-Diaza-1,3-dienes

A facile and dependable synthetic route for 5-amino-4-sulfonyl pyrazoles, which are substantially important in pharmaceuticals, is highly desirable. This work presents a novel cascade reaction for their efficient synthesis. The approach utilizes silver as a catalyst for C(sp2)-H sulfonylation of readily available starting materials 1,2-diaza-1,3-dienes with sulfinate salts, followed by intramolecular cascade cyclization annulation to afford the desired 5-amino-4-sulfonyl pyrazoles in good to excellent yields under mild conditions.

Recent advances in the synthesis and medicinal perspective of pyrazole-based α-amylase inhibitors as antidiabetic agents

Diabetes is a serious health threat across the globe, claiming millions of lives worldwide. Among the various strategies employed, inhibition of α-amylase is a therapeutic protocol for the management of Type 2 diabetes mellitus. α-Amylase is a crucial enzyme involved in the breakdown of dietary starch into simpler units. However, the clinically used α-amylase inhibitors have various drawbacks. Therefore, design and development of novel α-amylase inhibitors have gained significant attention. The pyrazole motif has been identified as a versatile scaffold in medicinal chemistry, and recent studies have led to the identification of various pyrazole-based α-amylase inhibitors. This review compiles therapeutic implications of pyrazole-appended α-amylase inhibitors; their synthesis, biological activities, structure-activity relationships and molecular docking studies are discussed.

Facile construction of C,N-disulfonated 5-amino pyrazoles through an iodine-catalyzed cascade reaction

A green and facile synthesis of previously unreported C,N-disulfonated 5-amino pyrazoles was established through an iodine-catalyzed cascade reaction.

Visible-light-mediated multi-component carbene transfer reactions of α-diazoesters to construct multisubstituted pyrazoles and 1,3-dicarbonyl derivatives

A visible-light-promoted strategy has been developed for the assembly of multisubstituted pyrazoles and 1,3-dicarbonyl derivatives via a multi-component carbene transfer reaction of α-diazoesters.

Transition Metal-Free De Novo Synthesis of Sulfonated Pyrazoles from Sulfonyl Hydrazides, 1,3-Diketones, and Sodium Sulfinates at Room Temperature

A transition metal-free method for de novo construction of diverse sulfonated pyrazoles from readily available sulfonyl hydrazides, 1,3-diketones, and sodium sulfinates was established under mild conditions. Pyrazoles bearing two different sulfonyl groups were obtained in one step. The method features a diversity of substituents of the pyrazole products and a remarkably simple work-up.

The crystal structure of ethyl 1-(4-nitrophenyl)-5-(trifluoromethyl)-1H-pyrazole-4-carboxylate, C13H10F3N3O4

C13H10F3N3O4, triclinic, P1̅ (no. 2), a = 7.0524(14) Å, b = 7.8044(16) Å, c = 12.954(3) Å, α = 97.93(3)°, β = 96.29(3)°, γ = 100.11(3)°, V = 688.6(3) Å3, Z = 2, R gt(F) = 0.0478, wR ref(F 2) = 0.1140, T = 200 K.

Metal-free molecular iodine-catalyzed direct sulfonylation of pyrazolones with sodium sulfinates leading to sulfonated pyrazoles at room temperature

A simple and highly efficient iodine-catalyzed sulfonylation of pyrazolones with sodium sulfinates has been developed under mild and metal-free conditions.