Cobalt‐Catalyzed Negishi Cross‐Coupling Reactions of (Hetero)Arylzinc Reagents with Primary and Secondary Alkyl Bromides and Iodides1. Issue 15 (18th February 2015)

• Record Type: Journal Article
• Authors: Hammann, Jeffrey M.; Haas, Diana; Knochel, Paul
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 15(2015)
• Page Start: 4478
• Page End: 4481
• Publication Date: 2015-02-18
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201411960
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>We report a cobalt‐catalyzed cross‐coupling of di(hetero)arylzinc reagents with primary and secondary alkyl iodides or bromides using THF‐soluble CoCl₂⋅2 LiCl and TMEDA as a ligand, which leads to the corresponding alkylated products in up to 88 % yield. A range of functional groups (e.g. COOR, CN, CF₃, F) are tolerated in these substitution reactions. Remarkably, we do not observe rearrangement of secondary alkyl iodides to unbranched products. Additionally, the use of cyclic TBS‐protected iodohydrins leads to trans‐2‐arylcyclohexanol derivatives in excellent diastereoselectivities (up to d.r.=99:1).</p> </abstract>