New easily functionalisable and highly fluorescent BOPAHY chromophores are synthesised via one pot two step reaction starting from commercially available pyrrole-2-carbaldehydes and respective acyl hydrazides in the presence of BF3·OEt2.

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Cycloaddition reactions have emerged as rapid and powerful method for constructing heterocycles and carbocycles. [3+2] Cycloadditions of nitroalkenes with various 1,3-dipoles have been an interesting research area for many organic chemists. This review outlines the synthesis of N-substituted and NH-1,2,3-triazoles along with other five membered N-heterocycles through cycloaddition reactions of nitroalkene. 1. Introduction 2. Synthesis of 1,2,3-triazoles 2.1.Synthesis of NH-1,2,3-triazoles 2.2.Synthesis of N-substituted 1,2,3-triazoles 3. Synthesis of Pyrrolidines and Pyrroles 4. Synthesis of Pyrazoles 5. Conclusion

The reactivity of readily available 4,5-fused-1-sulfonyl-1,2,3-triazoles was examined in the Rh­(II)-catalyzed transannulation reaction with nitriles. We have come across the interesting observation that 1-sulfonyl cycloalkeno­[d]­[1,2,3]­triazoles that possess β-hydrogens resist intramolecular β-hydride migration and could serve as a new source of Rh-iminocarbenoids for intermolecular Rh­(II)-catalyzed transannulation reactions. As a result, 1-sulfonyl cyclohexeno-, cyclohepteno-, dihydropyrano-, 5-phenyltetrahydrobenzo-, and 4,5-dihydronaphtho­[d]­imidazoles were synthesized from various nitriles in good yields. A one-pot methodology has also been executed for the synthesis of NH-imidazoles.