Journal
JOURNAL OF CATALYSIS
Volume 377, Issue -, Pages 609-618Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.07.059
Keywords
Porous BINOL polymers; Heterogenized phosphoric acid; Transfer hydrogenation; BINOL phosphate rhodium; Microwave activation
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Funding
- MINECO of Spain [MAT201782288-C2-2-P]
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Herein, we report the synthesis of adamantyl-BINOL-based chiral porous aromatic polymers (Ad-BINOL-PAFs) for heterogeneous catalysis. Ad-BINOL-OH-PAF (365 m(2).g(-1)SA(BET)) was built through the covalent bonds among of 4,4'-dibromo-O-ethyl-protected adamantyl-BINOL with 1,3,5-Triphenylbenzene-4',4 '',4'-triboronic acid and in the presence of [Ti(OiPr)(4)] results an effective recyclable catalyst in the asymmetric addition of diethylzinc to aromatic aldehydes (ee up to 88%). The corresponding heterogenized phosphoric acid (Ad-BINOL-PO2H-PAF) was applied as heterogeneous recyclable organocatalyst for the cascade condensation/amine addition of anthranilamide with aldehydes and transfer hydrogenation reactions obtaining high yields but low enantioselectivity. On the other hand, heterogeneous phosphoric acid (Ad-BINOLs-PO2H-PAF) was also used as effective phosphate ligands for synthesis of rhodium(II) complexes which were effective catalysts in cyclopropanation of styrene affording chiral cyclopropanes in good yield and high diastereoselectivity (>99%) and moderate enantioselectivity (ee < 50%). (C) 2019 Elsevier Inc. All rights reserved.
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