α-Hydroxyketones (OH-protected) are prepared in high enantiomeric purity by reaction of chiral O-protected 2-hydroxyalkanoic esters with organolithium compounds in ether/pentane at - 100°C or by conversion of 2-hydroxyalkanoic esters into 2-hydroxy-N,N-dimethylalkanamides, O-protection of these amides, and reaction with organomagnesium bromides in tetrahydrofuran/ether at 5°C.
α-羟基酮(OH保护)通过手性O保护的2-羟基烷酸酯与
有机锂化合物在-100°C的醚/
戊烷中反应,或通过将2-羟基烷酸酯转化为2-羟基-N,N-二甲基烷酰胺,保护这些酰胺,然后与
有机镁溴化物在5°C的
四氢呋喃/醚中反应,制备出高对映体纯度的α-羟基酮。