Calcium complexes with a bulky tris-(2-N-piperidinomethyl)-phenyl)methoxide ligand. Synthesis and catalytic activity in the dearomatization of N-heterocycles
- Authors: Selikhov A.N.1,2, Nelyubina Y.V.1, Trifonov A.A.1
-
Affiliations:
- Nesmeyanov Institute of Organoelement Compounds
- Razuvaev Institute of Organometallic Chemistry
- Issue: Vol 51, No 8 (2025)
- Pages: 519-528
- Section: Articles
- URL: https://ogarev-online.ru/0132-344X/article/view/306955
- DOI: https://doi.org/10.31857/S0132344X25080046
- EDN: https://elibrary.ru/lfgdpn
- ID: 306955
Cite item
Abstract
The reaction of equimolar amounts of tris-((2-N-piperidinomethyl)-phenyl)methanol ((2-C5H10NCH2-o-C6H4)3COH) with [(Me3Si)2N]2Ca(THF)2 (toluene, 23○C) allows to obtain a mixed-ligand calcium alkoxide-amide complex [(2-C5H10NCH2C6H4)3CO]CaN(SiMe3)2 (I) in 70% yield. X-ray diffraction analysis showed that in I the monoanionic alkoxide ligand is coordinated to the metal in the κ3-O,N,N-fashion. Complex I catalyzes the addition of PhSiH3 to annelated N-containing heterocycles: quinoline, 4-methylquinoline, 6-methylquinoline and isoquinoline. The reactions are chemo- and regioselective and are completd within 24-120 hours. The reaction of I with PhSiH3 (molar ratio 1 : 2) leads to the formation of the bis(alkoxide) complex [κ2-O,N-(2-C5H10NCH2C6H4)3CO]2Ca (II) and CaH2, which are the result of symmetrization of the intermediately formed calcium alkoxyhydride complex. In the crystal, complex II has a nonlinear structure with an OCa(1)O angle of 112.65(4)○, and only one of the piperidine fragments of both ligands is coordinated to the metal ion. The molecular structure of complexes I and II was established using X-ray diffraction (CCDC № 2443979 (I), 2443980 (II)).
About the authors
A. N. Selikhov
Nesmeyanov Institute of Organoelement Compounds; Razuvaev Institute of Organometallic Chemistry
Email: trif@iomc.ras.ru
Russian Federation, Moscow; Nizhny Novgorod
Yu. V. Nelyubina
Nesmeyanov Institute of Organoelement Compounds
Email: trif@iomc.ras.ru
Russian Federation, Moscow
A. A. Trifonov
Nesmeyanov Institute of Organoelement Compounds
Author for correspondence.
Email: trif@iomc.ras.ru
Russian Federation, Moscow
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