New chiral amino alcohol ligands for catalytic enantioselective addition of diethylzincs to aldehydes. Issue 11 (22nd February 2018)

• Record Type: Journal Article
• Authors: Sappino, Carla; Mari, Alessandra; Mantineo, Agnese; Moliterno, Mauro; Palagri, Matteo; Tatangelo, Chiara; Suber, Lorenza; Bovicelli, Paolo; Ricelli, Alessandra; Righi, Giuliana
• Is Part Of: Organic & biomolecular chemistry. Volume 16:Issue 11(2018)
• Page Start: 1860
• Page End: 1870
• Publication Date: 2018-02-22
• Subjects: Chemistry, Organic -- Periodicals; Bioorganic chemistry -- Periodicals; Chemistry, Physical organic -- Periodicals; 547
• DOI: 10.1039/c8ob00165k
• Languages: English
• ISSNs: 1477-0520

Abstract

Abstract : New amino alcohol ligands suitable for immobilization on nanoparticles were successfully used in catalytic enantioselective additions of diethylzinc to aldehydes. Abstract : A study aimed at the synthesis and structure optimization of new, efficient, optically active β-amino alcohol ligands with a structure suitable for immobilization on magnetite nanoparticles has been carried out. The optimized homogeneous amino alcohol catalysts13a and13b, the chirality of which arises from the Sharpless epoxidation of suitable allyl alcohols, were tested by employing the well-established enantioselective amino alcohol-promoted addition of diethylzinc to benzaldehyde, giving the corresponding benzyl alcohol with nearly quantitative yield and ee = 95%. Then, their broad applicability as chiral catalysts was evaluated by carrying out the same reaction on a family of aldehydes, including variously substituted aromatic ones as well as an aliphatic analogue. The results have confirmed the validity of the fine-tuning process performed on ligands13a and13b . In fact, both exhibited excellent catalytic activity as demonstrated by the chemical yields and ee obtained from all the tested aldehydes, almost independent of the position and type of substitution in the aromatic ring.