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An efficient silica-grafted poly-(l)-leucine catalyst for asymmetric epoxidation of α,β-unsaturated ketone

✍ Scribed by Fan Yang; Lin-Mei He; Hua Yi; Gang Zou; Jie Tang; Ming-Yuan He

Publisher: Elsevier Science
Year: 2007
Tongue: English
Weight: 188 KB
Volume: 273
Category: Article
ISSN: 1381-1169
DOI: 10.1016/j.molcata.2007.03.043

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✦ Synopsis

A new efficient covalent immobilization method for preparation of silica-grafted poly-(l)-leucine catalyst AP-PLL-Silica gel was developed. The AP-PLL-Silica gel catalyzed asymmetric epoxidation of benzalacetophenone, yielding optically active epoxy ketone in high enantioselectivity up to 97% e.e. The catalyst was easily separated and reused several times with no significant loss of activity and enantioselectivity.

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