The reductive amination of carboxylic acids was shown to be promoted by 2-chloropyridine hydrochloride (3 eq). It allowed the one-pot preparation of N-alkylamines in yields up to 93% from carboxylic acid (1 eq), amine (1 eq) and sodium borohydride (5 molar eq). The reaction, carried out with [11C]magnesium halide carboxylates (11C, β+, t1/2∶20 min), led to N-[11C]alkylamines in 20–25% radiochemical
The radiosynthesis of No-carrier added [1-11C]allyl alcohol evidence for the formation of a new reducing species: Lithium aluminium hydride - vinylmagnesium bromide
Lithium aluminium hydride in the presence of vinylmagnesium bromide (1:1 molar ratio) affords a potent reagent for the reduction of acrylic acid to allyl alcohol (ratio of allyl alcohol to 1-propanol: 3:2). This reducing mixture has allowed the preparation of nocarrier added [1-11C]allyl alcohol with a 25% yield (decay corrected at the end of radionuclide production, overall synthesis time including GC: 40 min) in a one step procedure from [11C]carbon dioxide (C-11: t1/2:20.4 min). [1-11C] 1-propanol was obtained in parallel with a 6.5% yield.