Diastereoselective Cobalt-Mediated Cross-Couplings of Cycloalkyl Iodides with Alkynyl or (Hetero)Aryl Grignard Reagents

Hammann, Jeffrey M.; Haas, Diana; Tüllmann, Carl-Phillip; Karaghiosoff, Konstantin und Knochel, Paul (2016): Diastereoselective Cobalt-Mediated Cross-Couplings of Cycloalkyl Iodides with Alkynyl or (Hetero)Aryl Grignard Reagents. In: Organic Letters, Vol. 18, No. 19: pp. 4778-4781

Abstract

A highly diastereoselective cross-coupling of variously substituted cycloalkyl iodides with alkynyl and (hetero)aryl Grignard reagents using cobalt(II) chloride has been successfully developed. With the THF-soluble CoCl2 center dot LiCl and the inexpensive ortho-phenanthroline derivative, neocuproine, as a ligand, diastereomeric ratios of up to 99:1 were achieved. A range of functional groups are tolerated in the Grignard reagent (e.g., CF3, Piy, CN, OPiv, NMe2, CO2NEt2, SF5, OTBS).

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 1523-7060
• Language: English