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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
Published on: February 6, 2019
Zr-Mediated Cyclization of Alkynes as a Transferable Protocol for Constructing C 2‑Symmetric and Other Chiral
Marko Purić1, Filip Duplić1, Ivana Nikšić-Franjić1
1Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10 000 Zagreb, Croatia.
Abstract:
The geometric configuration of the chiral Cp ligand and any alteration in its structure consequently influence the corresponding catalyst performance. This synergistic relationship drives the search for new chiral ligands, and with this work, we deliver a transferable methodology for constructing chiral C 2-symmetric and other Cp-ligands. The methodology utilizes Negishi's reagent to induce the cyclization of internal diynes derived from different chiral materials: (R)-BINOL, L-(+)-tartaric acid, and chiral primary amine. The subsequent reaction of the formed zirconium intermediate with diiodomethane gave a series of aryl-substituted chiral Cp-ligands. This approach allows structural modification of known ligands as well as the construction of completely new ones.
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