Poly(methylhydrosiloxane)-supported chiral imidazolinones: new versatile, highly efficient and recyclable organocatalysts for stereoselective Diels-Alder cycloaddition reactions |
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Authors: | Guizzetti Stefania Benaglia Maurizio Siegel Jay S |
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Affiliation: | Dipartimento di Chimica Organica e Industriale, Università di Milano, via Venezian 21, 20133, Milano, Italy. |
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Abstract: | Poly(methylhydrosiloxane) (PMHS) supported organic catalysts promoted the Diels-Alder reaction of dienes with α,β-unsaturated aldehydes, also in pure water, in yields and enantiomeric excesses comparable to those observed with the non-supported catalysts (up to 93% ee). Recycling of the catalysts was performed with no loss of enantioselectivity for at least five reaction cycles. |
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