A compound and method for producing an enantiomerically enriched epoxide from an olefin using a chiral ketone and an oxidizing agent is disclosed.
一种化合物及其生产方法被披露,该方法使用手性酮和氧化剂从烯烃生产具有对映体富集的环氧乙烷。
Selective Homologation of Ketones and Aldehydes with Diazoalkanes Promoted by Organoaluminum Reagents
作者:Keiji Maruoka、Amel B. Concepcion、Hisashi Yamamoto
DOI:10.1055/s-1994-25682
日期:——
Organoaluminum-promoted single homologation or ring expansion of ketones and aldehydes with diazoalkanes has been described, and among various organoaluminum reagents, exceptionally bulky methylaluminum bis(2,6-di-tert-butyl-4-methylphenoxide) (MAD) is found to be highly effective for the selective homologation of various ketones and aldehydes.
Probing Competitive Enantioselective Approach Vectors Operating in the Jacobsen−Katsuki Epoxidation: A Kinetic Study of Methyl-Substituted Styrenes
作者:Peter Fristrup、Brian B. Dideriksen、David Tanner、Per-Ola Norrby
DOI:10.1021/ja051851f
日期:2005.10.1
kinetic data for the reactivity of the seven possible methyl-substituted styrenes (mono-, di- and trisubstituted) relative to styrene itself, ee values were measured by chiral GC, and absoluteconfigurations were secured by chemical correlation. Of particular interest was the switch in absoluteconfiguration at the benzylic position of the epoxides derived from (Z)- and (E)-alpha,beta-dimethylstyrene,
Titanocene(III)‐Catalyzed Precision Deuteration of Epoxides
作者:Dina Schwarz G. Henriques、Elena Rojo‐Wiechel、Sven Klare、Regine Mika、Sebastian Höthker、Jonathan H. Schacht、Niklas Schmickler、Andreas Gansäuer
DOI:10.1002/anie.202114198
日期:2022.2
Titanocene catalysis delivers D to the more substituted C-atom of epoxides with high efficiency, deuterium incorporation, and stereoselectivity. A novel method of catalyst activation that prevents isotope scrambling warrants the excellent performance of the reaction.
二茂钛催化将 D 传递至环氧化物中取代较多的 C 原子,具有高效率、氘并入和立体选择性。一种防止同位素扰乱的催化剂活化新方法保证了反应的优异性能。
Asymmetric Epoxidation of Unfunctionalized Olefins Catalyzed by Chiral (Pyrrolidine Salen) Mn (III) Complexes with Proline Sidearms
D-Boc-N-proline, L-proline, D-proline as respective sidearms, as well as their manganesecomplexes were synthesized and characterized. These Salen-Mn(III) complexes were applied to the asymmetric epoxidations of unfunctionalizedolefins with NaClO, and m-CPBA as respective oxidants. The catalysis of the Salen-Mn (III) complexes varied with the change of sidearms. The one with D-Boc-N-proline as a sidearm