Peptide-Catalyzed Conjugate Addition Reactions of Aldehydes to Nitroolefins
作者:Helma Wennemers、Markus Wiesner
DOI:10.1055/s-0029-1218651
日期:2010.5
The tripeptide H-d-Pro-Pro-Glu-NH2 is an efficientcatalyst for conjugate addition reactions of aldehydes to nitroolefins. Chiral γ-nitroaldehydes are obtained in excellent yields and stereoselectivities in the presence of as little as 1 mol% of the tripeptidecatalyst. Under further optimized reaction conditions the product was obtained in essentially perfect stereoselectivity (syn/anti, >99:1, 99%
三肽H - d -Pro-Pro-Pro-Glu-NH 2是用于醛与硝基烯烃的共轭加成反应的有效催化剂。在低至1摩尔%的三肽催化剂存在下,以优异的收率和立体选择性获得了手性γ-硝基醛。在进一步优化的反应条件下,获得的产物具有基本完美的立体选择性(顺/反,> 99:1,99%ee)。 不对称催化-共轭加成反应-有机催化-肽-脯氨酸
Peptide Catalyzed Asymmetric Conjugate Addition Reactions of Aldehydes to Nitroethylene—A Convenient Entry into γ<sup>2</sup>-Amino Acids
作者:Markus Wiesner、Jefferson D. Revell、Sandro Tonazzi、Helma Wennemers
DOI:10.1021/ja801027s
日期:2008.4.1
The peptide H-D-Pro-Pro-Glu-NH2 is a highly effective catalyst for conjugateadditionreactions between aldehydes and nitroethylene. Only 1 mol % of H-d-Pro-Pro-Glu-NH2 and a 1.5-fold excess of aldehyde with respect to nitroethylene suffice to obtain gamma-nitroaldehydes and, after reduction, monosubstituted gamma-nitroalcohols in excellent yields and optical purities. The products can be readily converted