39067-39-5Relevant articles and documents
DABCO-based chiral ionic liquids as recoverable and reusable organocatalyst for asymmetric Diels–Alder reaction
Aalam, Mohd Jubair,Deepa,Chaudhary, Pooja,Meena, Dhan Raj,Yadav, Geeta Devi,Singh, Surendra
supporting information, p. 134 - 146 (2021/11/16)
New DABCO-based chiral ionic liquids were synthesized and evaluated in asymmetric Diels–Alder reaction of cyclopentadiene with α,β-unsaturated aldehydes or 4-phenyl-3-buten-2-one. Chiral ionic liquid of modified MacMillan catalyst having a DABCO cation and hexafluorophosphate anion acts as organocatalyst (5?mol%) for the Diels–Alder reaction of crotonaldehyde and cyclopentadiene producing 98% of the product and 87% ee (endo) in CH3CN/H2O (95/5) at 25°C in 2?h. The scope and limitations of the catalysis were also studied by using cyclopentadiene and α,β-unsaturated aldehydes, and the Diels–Alder products were obtained in 18%–92% yields with 68%–93% ee. The catalyst was recycled and reused up to 6 cycles with a slight drop in ee and conversion of the product.
Pentaerythritol-supported chiral imidazolone and preparation method as well as use thereof
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Paragraph 0023, (2016/10/08)
The invention relates to pentaerythritol-supported chiral imidazolone. The structure of the pentaerythritol-supported chiral imidazolone is shown in the description. Chiral imidazolone is supported on pentaerythritol to obtain a novel pentaerythritol-supp
Improving catalyst activity in secondary amine catalysed transformations
Brazier, John B.,Gibbs, Timothy J. K.,Rowley, Julian H.,Samulis, Leopold,Yau, Sze Chak,Kennedy, Alan R.,Platts, James A.,Tomkinson, Nicholas C. O.
supporting information, p. 133 - 141 (2015/02/05)
The effect on catalyst performance of altering substituents at the 2-position of the Macmillan imidazolidinone has been examined. Condensation of l-phenylalanine N-methyl amide with acetophenone derivatives results in a series of imidazolidinones whose sa