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DOI: 10.1055/s-2006-950196
Reaction of Nitroorganic Compounds Using Thiourea Catalysts Anchored to Polymer Support
Publication History
Publication Date:
15 August 2006 (online)
Abstract
Immobilization of chiral thiourea catalyst was studied. The PEG-bound thiourea showed better catalytic activity than those of the carboxypolystyrene HL resin-bound and TentaGel carboxy resin-bound thioureas. In the presence of PEG-bound thiourea, Michael and tandem Michael reactions of trans-β-nitrostyrene proceeded enantioselectively.
Key words
organocatalyst - thiourea - enantioselective - polymer support - PEG
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References
Details are provided in the experimental section.
10In a previous study on the reaction of 7 using original thiourea 1, the adduct 8 was obtained in 87% yield with 67% ee, after being stirred in CH2Cl2 at room temperature for 24 h. [7c]
12Poly(ethylene glycol) (Mn 8000) was purchased from Sigma-Aldrich.
13Characterization data for compounds 6, [14] 8 [7c] and 16 [7g] have been reported.