Organocatalysis Mediated by (Thio)urea Derivatives
Tóm tắt
Over the last decade the potential for
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Tài liệu tham khảo
I. Fleming Frontier Orbitals and Organic Chemical Reactions Wiley‐Interscience Chichester 1978.
It is perhaps useful to distinguish here between this mode of metal(ion)‐based catalysis which relies on Lewis acid/Lewis base interactions and those involving discrete covalently bound intermediates in which the metal often (but not always) changes oxidation state in the catalytic cycle (e.g. Pd/Ni coupling reactions Os‐mediated oxidations Ru‐catalysed olefin metathesis etc.).
2000, Lewis Acids In Organic Synthesis
1999, Lewis Acid Reagents
1999, Comprehensive Asymmetric Catalysis
Noyori R., 1994, Asymmetric Catalysis In Organic Synthesis
For recent reviews on this topic see:
For instructive reviews concerning general acid–base catalysis see:
For recent general reviews concerning organocatalysis see:
For representative references see:
For recent references concerning (asymmetric) organocatalysis mediated by diols see:
For further general references see:
Curran D. P., 1995, Tetrahedron Lett., 36, 6647
A direct comparison between the performance of9and14was complicated by the slow decomposition of the latter at temperatures required for the Claisen rearrangement to proceed at a convenient rate.
J. March Advanced Organic Chemistry 4th ed. Wiley‐Interscience New York 1992.
For recent discussions proposing alternative mechanisms in non‐polar solvents see:
The slow decomposition of24under the reaction conditions limits its utility in this reaction.
Dessole G., 2004, Synlett, 2374
The opposite antipode of37 c dto those shown in Scheme 8 was used in references [40] and [42].
Wenzel A. G., 2003, Synlett, 1919
For recent reviews of bifunctional catalysis see:
Kato N., 2005, Synlett, 1491
Xu X., 2005, Chem. Eur. J., 11, 1
Lee B.‐ J., 2005, Synlett, 605