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Imidazolium ionic liquids containing second‐generation MacMillan catalysts were synthesized and evaluated as organocatalysts (10 mol%) for enantioselective Friedel‐Crafts reaction between N‐benzylindole and crotonaldehyde using trifluoroacetic acid as a co‐catalyst (10 mol%) at −60 °C, the corresponding product was obtained in 87 % yield with 89 % ee. The scope and limitation of organocatalyst were...
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...
Imidazolidin‐4‐one is used as a recoverable organocatalyst for the asymmetric Diels‐Alder reaction in the presence of catalytic amount of dicationic ionic liquid and trifluoroacetic acid as a co‐catalyst. The Diels‐Alder reaction between model substrate cyclopentadiene and crotonaldehyde gave the product in 95% conversion and 87% ee of the endo‐product. The catalyst was shown better reusability when...
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