2-Imidazoline– and 1,4,5,6-TETRAHYDROPYRIMIDINE (cas 1606-49-1)–ruthenium(II) complexes and catalytic synthesis of furan

Add time:07/18/2019    Source:sciencedirect.com

The complexes RuCl2(L1)(arene) (3–4) (L1=HCNCH2CH2NR, R=Et, arene=p-MeC6H4CHMe2 or C6Me6) and RuCl2(L2)(arene) (5–6) (L2=HCNCH2CH2CH2NR, R=Me, Ph, CH2Ph, p-MeC6H4) have been synthesized by reaction of [RuCl2(arene)]2 with 1-alkyl-2-imidazoline (1) or 1-alkyl-1,4,5,6-tetrahydropyrimidine (2). In each of these complexes (3–6) the ligand is bound via the imine (NC) nitrogen atom. The new complexes are capable of catalyzing the activation of (Z)-3-methylpent-2-en-4-yn-1-ol into 2,3-dimethylfuran in very good yield, via intramolecular cyclization, and the 1,4,5,6-tetrahydropyrimidine complexes 5 and 6 appeared to be the best catalyst precursors. Cyclic voltammetry shows that the nature of the arene ligand, rather than that of the nitrogen containing ligand, controls the electron-richness of the complexes.

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