89901-51-9Relevant articles and documents
Efficient preparation of (3S)-3-(4-fluorobenzyl)piperidinium mandelate
Emmett, George C.,Cain, Gary A.,Estrella, Melissa J.,Holler, Edd R.,Piecara, James S.,Blum, Andrew M.,Mical, Alfred J.,Teleha, Christopher A.,Wacker, Dean A.
, p. 92 - 96 (2007/10/03)
Methods for the preparation of (3S)-3-(4-fluorobenzyl)piperidine (2) and its mandelate salt (9) are described. The first generation synthesis started from 3-benzylpiperidone, and required Boc protection of the nitrogen for efficient separation of the enantiomers using chromatography on a chiral stationary phase. Subsequently, a resolution method using (R)-mandelic acid, produced high %ee salt 9 after recrystallization and eliminated the need for Boc protection. The third generation route, starting from pyridine-3- carboxaldehyde, led to a streamlined synthesis of racemate 2 and was optimized for producing multi-hundred gram quantities of the chiral salt.
Extended scope of in situ iodotrimethylsilane mediated selective reduction of benzylic alcohols
Cain,Holler
, p. 1168 - 1169 (2007/10/03)
Iodotrimethylsilane, generated in situ from chlorotrimethylsilane and sodium iodide in acetonitrile, selectively reduces moderately electron deficient benzylic alcohols to the analogous toluenes; other reduction sensitive functional groups such as ketone, aldehyde, nitrile, and nitro are unaffected.
