Md. Rumum Rohman

Reaction of selenium dioxide with aromatic ketones in the presence of boron triflouride etherate: a protocol for the synthesis of triarylethanones.

An efficient regioselective protocol for the C-C bond formation by the unexpected α,α-diarylation of aromatic ketones with unactivated arenes in the presence of selenium dioxide and boron trifluoride etherate has been developed. The generality and functional tolerance of this protocol is demonstrated by the synthesis of a series of triarylethanones.

Synthetic Developments in Functionalized Pyrano[2,3-c]pyrazoles. A Review

Introduction ................................................................................. 254 I. General Types and Structure of Pyranopyrazoles .......................... 255 II. Modes of Pyrano[2,3-c]pyrazole Synthesis..................................... 255 III. Two-component Synthesis of Pyrano[2,3-c]pyrazoles..................... 256 IV. Three-component Synthesis of Pyrano[2,3-c]pyrazoles .................. 276 V. Four-component Synthesis of Pyrano[2,3-c]pyrazoles .................... 292 Acknowledgment .......................................................................... 299 References .................................................................................... 299

Synthesis of β-Amino Carbonyl Compounds via the Iodine-Alumina Catalyzed Three-Component Coupling Reaction under Microwave Irradiation

Iodine-alumina was employed as a catalyst in the coupling reactions of aldehydes, enolizable ketones, or 1,3-dicarbonyls with methyl carbamate or aromatic amines under microwave irradiation to afford β-amino carbonyl compounds in good-to-excellent yields. The key features of this environmentally friendly methodology are its operational simplicity, mild reaction conditions, and less reaction time.