Synthesis of 3-Aminotropones fromN-Boc-Protected Furan-2-amine (=tert-Butyl Furan-2-ylcarbamate; Boc=(tert-Butoxy)carbonyl) by Cycloaddition Reactions and Subsequent Rearrangement
作者:Ángel M. Montaña、Juan A. Barcia、Gabriele Kociok-Köhn、Mercè Font-Bardia、Xavier Solans
DOI:10.1002/hlca.200890024
日期:2008.2
The 3-aminotropones (=3-aminocyclohepta-2,4,6-trien-1-ones) 4 were prepared in two steps by i) a [4+3] cycloadditionreaction between a conveniently substituted α,α′-dihalo ketone 1 and a furan-2-amine derivative 2 functionalized at C(2) by a protected amino group (3), and ii) a base-induced molecular rearrangement of the cycloadduct 3via cleavage of the O-bridge. A mechanism for the formation of 3-aminotropones