A novel process for the preparation of compounds of formula (I): R1 = CN, OP (P=any suitable protecting group), alkyl, aryl or hetroaryl, R2 = Alkyl or aryl by reacting a compound of formula (II): R1 = CN, OP (P=any suitable protecting group), alkyl, aryl or hetroaryl, R2 = Alkyl or aryl with a reducing agent, sodium borohydride in presence of metal halides, preferably CeC13 or metal alkoxides, preferably Ti(OiPr)4.
一种制备式(I)化合物的新工艺:其中R1 = CN,OP(P = 任何适当的保护基),烷基,芳基或杂芳基,R2 = 烷基或芳基,通过将式(II)化合物与还原剂
钠硼氢化物在
金属卤化物(优选为
CeCl3)或
金属烷氧化物(优选为Ti(OiPr)4)存在下反应。