Manganese-Catalyzed Asymmetric Formal Hydroamination of Allylic Alcohols: A Remarkable Macrocyclic Ligand Effect.
Angew Chem Int Ed Engl
; 61(26): e202202972, 2022 Jun 27.
Article
em En
| MEDLINE
| ID: mdl-35438237
ABSTRACT
A unique family of chiral peraza N6 -macrocyclic ligands, which are conformationally rigid and have a tunable saddle-shaped cavity, is described. Utilizing their manganese(I) complexes, the first example of earth-abundant transition metal-catalyzed asymmetric formal anti-Markovnikov hydroamination of allylic alcohols was realized, providing a practical access to synthetically important chiral γ-amino alcohols in excellent yields and enantioselectivities (up to 99 % yield and 98 % ee). The single-crystal structure of a MnI complex indicates that the manganese atom coordinates with the chiral dialkylamine moiety in a bidentate fashion. Further DFT calculations revealed that five of the six nitrogen atoms in the ligand were engaged in multiple noncovalent interactions with Mn, an isopropanol molecule, and a ß-amino ketone intermediate via coordination, hydrogen bonding, and/or CHâ
â
â
π interactions in the transition state, showing a remarkable role of the macrocyclic framework.
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MEDLINE
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En
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Angew Chem Int Ed Engl
Ano de publicação:
2022
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Article