Journal
SYNLETT
Volume 32, Issue 19, Pages 1943-1947Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0040-1720885
Keywords
operando XAFS; DFT; iron; asymmetric cycloaddition; Diels-Alder
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (Japan) [20H02737, 18H04253, 17KT0006]
- Grants-in-Aid for Scientific Research [20H02737, 18H04253] Funding Source: KAKEN
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The enantioselective oxa-Diels-Alder reaction of nonactivated substrates using FeCl3 and a 1,1'-bi-2-naphthol (BINOL) derived chiral phosphoric acid as a multiple activation catalyst was successfully achieved in this study. Various oxygen-containing six-membered heterocycles were synthesized in high yields and in an enantioselective manner. Density functional theory (DFT) calculations revealed the synergistic activation of two lone pairs of an aldehyde by both Lewis acidic and Bronsted acidic moieties in the catalyst system to facilitate enantioselective addition reaction of dienes.
The enantioselective oxa-Diels-Alder reaction of nonactivated substrates by utilizing FeCl3 and a 1,1'-bi-2-naphthol (BINOL) derived chiral phosphoric acid as a multiple activation catalyst is reported. Various oxygen-containing six-membered heterocycles were obtained in high yields and in an enantioselective manner. Density functional theory (DFT) calculations elucidate that both Lewis acidic and Bronsted acidic moieties in the catalyst system synergistically activate two lone pairs of an aldehyde to facilitate enantioselective addition reaction of dienes.
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