Controllable Preparation of Chiral Oxazoline-Cu(II) Catalyst as Nanoreactor for Highly Asymmetric Henry Reaction in Water

Preparation of chitosan/cellulose composite copper catalyst for green synthesis in the construction of C–Si bonds in aqueous phase

“…42 Furthermore, the recycling and reuse of Cu(II) catalysts remain challenging due to the deactivation or decomposition of non-immobilized Cu(II) salts. 45 Polysaccharides like chitosan and cellulose are low cost and easy to obtain, and have been acknowledged as versatile support materials for catalyst systems. 46,47 These polymers have abundant hydroxyl and amine groups, which can easily coordinate with metals.…”

“…42 Furthermore, the recycling and reuse of Cu( ii ) catalysts remain challenging due to the deactivation or decomposition of non-immobilized Cu( ii ) salts. 45…”

Cellulose-supported hyper-crosslinked l-tryptophan as an efficient chiral catalyst support for improved catalytic performance

“…The Henry reaction, also known as the nitro-aldehyde reaction, occupies an important role in organic chemical synthesis: this reaction is key for the coupling of nucleophilic nitroalkanes with electrophilic aldehydes or ketones to yield b-nitroalcohols, which are of high use value. [25][26][27] The Henry reaction primarily includes nitronate condensations, the retro-Henry reaction, and the intramolecular Henry reaction. 28,29 An important feature of the Henry reaction is that selectivity of the enantiomers or nonenantiomers can be achieved.…”

Partially carbonized chiral polymer with Cu-bis(oxazoline) as an efficient heterogeneous catalyst for asymmetric Henry reaction

“…15–18 Among them, the chiral bis(oxazoline) (BOX) ligand 19 coordinated with copper species is considered the most reliable catalyst for the Henry reaction. 20 To date, however, the chiral heterogeneous catalyst derived from direct polymerization of BOX for the asymmetric Henry reaction has been far less investigated.…”