A Route to the C,D,E Ring System of the <i>Aspidosperma</i> Alkaloids
作者:Geoffrey M. Giampa、Jian Fang、Matthias Brewer
DOI:10.1021/acs.orglett.6b01674
日期:2016.8.19
A shortsynthetic sequence leading to the formation of the C,D,E-ring subunit of the Aspidosperma alkaloids is reported. This route is based on a ring fragmentation/intramolecular azomethine ylide 1,3-dipolar cycloaddition reaction sequence that gives the desired tricyclic product as a single diastereomer. A γ-amino-β-hydroxy-α-diazo carbonyl compound is shown to fragment in the presence of a Lewis