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