Enantioselective Enolate Protonation with Chiral Anilines: Scope, Structural Requirements, and Mechanistic Implications
作者:E. Vedejs、A. W. Kruger、N. Lee、S. T. Sakata、M. Stec、E. Suna
DOI:10.1021/ja994437m
日期:2000.5.1
substitution at the γ-carbon, γ-protonation can be a competing reaction in the case of the aliphatic substrates 12, 14b, 14d, and 18. The evidence is most consistent with a mechanism that involves proton transfer from 1a to a mixed aggregate consisting of enolate 4a and the lithiated amide 5, but direct proton transfer from 1a to the enolate is not ruled out.
Synthesis of γ‐Spirolactams by Birch Reduction of Arenes
作者:Tobias Krüger、Torsten Linker
DOI:10.1002/ejoc.202100056
日期:2021.3.12
Birchreduction of arene carboxylic acids in the presence of chloroacetonitrile affords nitriles and their subsequent catalytic hydrogenation γ‐spirolactams in only 3 steps with excellent stereoselectivities. It is possible to control the degree of saturation by variation of the catalyst at different pressures. Thus, more than 15 new γ‐spirolactams have been synthesized from inexpensive starting materials