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- Title
A N‐Heterocyclic Carbene‐Supported Zinc Catalyst for the 1,2‐Regioselective Hydroboration of N‐Heteroarenes.
- Authors
Mondal, Sumana; Singh, Tejender; Baguli, Sudip; Ghosh, Soumya; Mukherjee, Debabrata
- Abstract
A fluorenyl‐tethered N‐heterocyclic carbene LH (LH=[(Flu)H−(CH2)2−NHCDipp]) and its monoanionic version L− are explored in complexation with zinc towards the hydroboration of N‐heteroarenes, carbonyl, ester, amide, and nitrile under ambient condition. The N‐heteroarenes exhibit high 1,2‐regioselectivity which is justified by computational analyses. The relative hydroboration rates of differently p‐substituted (electron donating vs. withdrawing) pyridines are also addressed. The monodentate LH offers a better catalytic activity than the chelating L− for steric reasons despite both giving three‐coordinate zinc complexes. The mechanism involves a Zn−H species at the heart of these catalytic processes which is trapped by Ph2CO. Computational studies suggest that the barrier to form the hydride complex is comparable to the barrier required for the following hydride transfer to pyridine.
- Subjects
ZINC catalysts; HYDROBORATION; ZINC compounds; CATALYTIC activity; INFLUENZA
- Publication
Chemistry - A European Journal, 2023, Vol 29, Issue 38, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202300508