Synthesis of β-Amino Acids Based on Oxidative Cleavage of Dihydropyridone Derivatives
摘要:
A new method for the synthesis of beta-amino acids based on 2,3-dihydropyridones as starting materials is presented. Conversions of 2,3-dihydropyridones with NalO(4) and subsequently with base gave the corresponding beta-amino acids in a one-pot procedure. The reactions have been monitored by H-1 NMR indicating that the beta-amino acids were formed in quantitative yields mostly. This method appears to be of broad scope, as 2-substituted 2,3-dihydropyridones are easily accessible via N-acyliminium ions generated from 4-methoxypyridine.
Synthesis of β-Amino Acids Based on Oxidative Cleavage of Dihydropyridone Derivatives
摘要:
A new method for the synthesis of beta-amino acids based on 2,3-dihydropyridones as starting materials is presented. Conversions of 2,3-dihydropyridones with NalO(4) and subsequently with base gave the corresponding beta-amino acids in a one-pot procedure. The reactions have been monitored by H-1 NMR indicating that the beta-amino acids were formed in quantitative yields mostly. This method appears to be of broad scope, as 2-substituted 2,3-dihydropyridones are easily accessible via N-acyliminium ions generated from 4-methoxypyridine.
Comparison of Ru- and Mo-Based Chiral Olefin Metathesis Catalysts. Complementarity in Asymmetric Ring-Opening/Cross-Metathesis Reactions of Oxa- and Azabicycles
作者:G. Alex Cortez、Carl A. Baxter、Richard R. Schrock、Amir H. Hoveyda
DOI:10.1021/ol071008h
日期:2007.7.1
A comparative study of chiral Mo- and Ru-based catalysts to promote enantioselective synthesis of 2,6-disubstituted pyrans and piperidines through asymmetricring-opening/cross-metathesis (AROM/CM) reactions is presented. These studies demonstrate the critical complementarity that exists between the two classes of chiralcatalysts.