Diastereoselective synthesis of linear-fused tricyclic nitrogen heterocycles by a tandem reduction-reductive amination reaction
作者:Richard A. Bunce、Derrick M. Herron、Jason R. Lewis、Sharadsrikar V. Kotturi、Elizabeth M. Holt
DOI:10.1002/jhet.5570400113
日期:2003.1
initiates a reaction sequence involving (1) reduction of the aromatic nitro group, (2) condensation of the resulting hydroxyl-amine or aniline nitrogen with the cycloalkanone and (3) reduction of the imine. The products are isolated in high yield as single diastereomers having the trans-fused ring junction. The observed selectivity is rationalized in terms of a steric effect imposed by the ester group in