A series of novel beta-hydroxyamide based catalysts for borane-mediated enantioselective reductions of prochiral ketones

作者：Azizoglu Murat; Erdogan Asli; Arslan Nevin; Turgut Yilmaz^*; Hosgoren Halil; Pirinccioglu Necmettin^*

来源：Tetrahedron: Asymmetry , 2016, 27(14-15): 614-622.

DOI：10.1016/j.tetasy.2016.06.003

The enantioselective reduction of prochiral ketones with borane in the presence of a chiral ligand has received considerable attention. Hydroxylamine-based chiral ligands with amide and hydroxyl functions in the presence of other co-ordinating groups are highly effective in these asymmetric reductions. The current work presents a simple one step synthesis of a series of beta-hydroxyamide-based ligands from the reaction between 3-hydroxy-2-naphthoic acid and chiral amino alcohols and their applications as catalysts in asymmetric borane-mediated reductions of aromatic prochiral ketones in THE The reductions provided the corresponding secondary alcohols with up to 96% ee and in good to excellent yields (89-99%). OFF calculations at B3LYP/6-31+g(d) level offered theoretical models to account for the enantioselectivity imposed by the chiral ligands in the reductions of the ketones.

• 出版日期2016-8-15