of new chiralauxiliaries, 7-alkyl substituted cis-1-amino-2-indanol derivatives, was established by the Diels–Alder reaction of 1-substituted dienes with cyclopentenone followed by the asymmetric epoxidation of the resulting indene derivatives and then the Ritter reaction. These bulky cis-aminoindanol derivatives are very effective as chiralauxiliaries and nitrogen sources in the asymmetric 6π-azaelectrocyclization
Highly Stereoselective Asymmetric 6π-Azaelectrocyclization Utilizing the Novel 7-Alkyl Substituted <i>cis</i>-1-Amino-2-indanols: Formal Synthesis of 20-Epiuleine
作者:Katsunori Tanaka、Shigeo Katsumura
DOI:10.1021/ja026464+
日期:2002.8.1
Highly stereoselective asymmetric 6pi-azaelectrocyclization was achieved with generality, based on the reaction between the (E)-3-carbonyl-2,4,6-trienal compounds and the (-)-7-alkyl-cis-1-amino-2-indanol derivatives as the effective novel chiral amines. Furthermore, the chiralauxiliaries of the cyclized products obtained were efficiently removed by the novel manganese dioxide oxidation under remarkably
Development of Highly Stereoselective Asymmetric 6π-Azaelectrocyclization of Conformationally Flexible Linear 1-Azatrienes. From Determination of Multifunctional Chiral Amines, 7-Alkyl <i>cis</i>-1-Amino-2-indanols, to Application as a New Synthetic Strategy: Formal Synthesis of 20-Epiuleine
The highlystereoselective asymmetric 6π-azaelectrocyclization was achieved as a general synthetic method based on the reaction between the (E)-3-carbonyl-2,4,6-trienal compounds and the (−)-7-alkyl-cis-1-amino-2-indanol derivatives which are effective chiral amines. The 7-alkyl-substituted 2-indanol moiety of the cyclized products was efficiently removed by the novel manganese dioxide oxidation under
Significant Acceleration of 6π-Azaelectrocyclization Resulting from a Remarkable Substituent Effect and Formal Synthesis of the Ocular Age Pigment A2-E by a New Method for Substituted Pyridine Synthesis
by molecular orbital calculations. The formal synthesis of the unusual retinal metabolite, A2-E, was achieved by two types of the new one-pot synthesis of substituted pyridines by utilizing the obtained facile 6 pi-azaelectrocyclization, one of which is compatible with the proposed metabolic pathway of A2-E.