Asymmetric epoxidation of chromenes catalyzed by chiral pyrrolidine SalenMn(III) complexes with an anchored functional group
2008 (English)In: Applied organometallic chemistry, ISSN 0268-2605, E-ISSN 1099-0739, Vol. 22, no 10, 592-597 p.Article in journal (Refereed) Published
Chiral pyrrolidine SalenMn(III) complexes with an anchored functional group at the N-aza-substituent in the pyrrolidine backbone were synthesized, and used as catalysts for asymmetric epoxidation of substituted chromenes. The complex 1 with an anchored imidazole as acceptor could effectively catalyze epoxidation of substituted chromenes in the absence of expensive additive 4-phenyl pyridine N-oxide (PPNO) by the coordination of the anchored organic base to the central manganese ion. Complexes 2 and 3 with a quaternary ammonium salt unit at the Naza-substituent in the pyrrolidine backbone displayed higher activities than Jacobsen catalyst and the analogous complex 4 without anchored functional group in the aforementioned reaction.
Place, publisher, year, edition, pages
2008. Vol. 22, no 10, 592-597 p.
IdentifiersURN: urn:nbn:se:kth:diva-17867DOI: 10.1002/aoc.1450ISI: 000259780600007ScopusID: 2-s2.0-53449097422OAI: oai:DiVA.org:kth-17867DiVA: diva2:335912
QC 201005252010-08-052010-08-05Bibliographically approved