as central intermediate. Stereoselectivereduction of the ketone 13 with LiBH4 led to the alcohol 14, which was benzylated and reduced to provide the final bicyclic products 16 and 17. Whereas the alcohol 16 shows only moderate affinity to both σ receptor subtypes, the benzyl ether 17 represents a potent and selective σ1 receptor ligand (Ki = 47 nM). Comparison of the σ receptor affinities of 16 and
Synthesis and biological evaluation of conformationally restricted σ1 receptor ligands with 7,9-diazabicyclo[4.2.2]decane scaffold
作者:Sunil K. Sunnam、Dirk Schepmann、Elisabeth Rack、Roland Fröhlich、Katharina Korpis、Patrick J. Bednarski、Bernhard Wünsch
DOI:10.1039/c0ob00402b
日期:——
key step in the synthesis of the 7,9-diazabicyclo[4.2.2]decane system was a modified Dieckmann condensation of piperazinebutyrate 11, which makes use of trapping the first cyclized intermediate with TMS-Cl. Reduction of the bicyclic ketone 14 with LiBH4 at −90 °C provided diastereoselectively (>99 : 1) the syn-configured alcohol 15a, which was converted into the final alcohol and ethers 16a–g. The configuration