Vedejs E., Lee N., Sakata S. T., J. Amer. Chem. Soc., 116 (1994) N 5, S 2175-2176
作者:Vedejs E., Lee N., Sakata S. T.
DOI:——
日期:——
Deracemization via Highly Enantioselective Enolate Protonation Using a Chiral Aniline as the "Acid"
作者:E. Vedejs、N. Lee、S. T. Sakata
DOI:10.1021/ja00084a080
日期:1994.3
Diastereoselective Osmylation and Hydroboration of β,γ-Unsaturated <i>N,N</i>-Diisopropylamides and Acid-Catalyzed Conversion to δ-Lactones
作者:E. Vedejs、A. W. Kruger
DOI:10.1021/jo990119u
日期:1999.6.1
The title reactions of beta,gamma-unsaturated N,N-diisopropylamides occur with useful diastereofacial selectivity. The major diol isomer from osmylation of alkenes 1, 10, 11, and 12 in the presence of TMEDA at -78 degrees C corresponds to the facial preference shown in transition state model 41 (R-z = H), while the opposite preference for 42 is observed with the Z-alkene 13. (Table 1). Hydroboration with g-BBN does not show this inversion of diastereofacial selectivity for the Z-alkene. All of the results in Table 2 correspond to the usual preference for a transition state such as 45. Acid-catalyzed lactonization of the alcohols obtained in Tables 1 and 2 can be carried out with overall retention of configuration to afford delta-lactones. Butenolide 5 was prepared with 90% se from alcohol 2a via osmylation followed by acid-catalyzed lactonization to 3 and elimination using SOCl2/pyridine.
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.