Enantiomerically pure 2-(1-hydroxyalkyl)pyridines were prepared via reaction of 2-lithiopyridine with (R)-2,3-O-isopropylideneglyceraldehyde, methyl (S)-2-methoxypropionate and methyl (S)-2-methoxy-2-phenylacetate, obtained from D-mannitol, L-lactic acid and L-mandelic acid, respectively. 6,6′-Bis(1-hydroxyalkyl)-2,2′-bipyridines were obtained from the same naturally occurring chiral compounds and 2-bromo-6-lithiopyridine with subsequent Ni-catalysed coupling.
通过 2-
硫代
吡啶与(R)-2,3-O-异亚丙基
甘油醛、
(S)-2-甲氧基丙酸甲酯和(S)-2-甲氧基-2-苯基
乙酸甲酯的反应,制备了对映体纯度较高的 2-(1-羟基烷基)
吡啶,这些对映体分别来自 D-
甘露醇、
L-乳酸和 L-
扁桃酸。6,6′-双(1-羟基烷基)-2,2′-联
吡啶是由相同的天然手性化合物和 2-
溴-6-
硫代
吡啶经 Ni 催化偶联得到的。