Provided is an inexpensive and industrially advantageous method for preparing (3R,4S)-3-(N-substituted aminomethyl)-4-fluoropyrrolidine or an enantiomer thereof which can be an intermediate for producing pharmaceuticals. It relates to a method for preparing (3R,4S)-3-(N-substituted cyclopropylaminomethyl)-4-fluoropyrrolidine derivative or ait's enantiomer, or their salts, comprising a step of fluorinating a 4-hydroxy-3-(N-substituted aminomethyl)pyrrolidine derivative represented by the general formula (1) or an enantiomer thereof using a sulfur tetrafluoride derivative.
[In the formula (1), PG represents a protective group for the amino group, and R
1
represents a C1 to C6 alkyl group which may be substituted, or a C3 to C8 cycloalkyl group which may be substituted.]
提供了一种廉价且在工业上具有优势的方法,用于制备(3R,4S)-3-(N-取代
氨甲基)-4-
氟吡咯烷或其对映体,其可作为生产药物的中间体。该方法涉及制备(3R,4S)-3-(N-取代环丙基
氨甲基)-4-
氟吡咯烷衍
生物或其对映体或它们的盐,其中包括使用
硫四
氟化物衍
生物对一般式(1)所表示的
4-羟基-3-(N-取代
氨甲基)
吡咯烷衍
生物或其对映体进行
氟化的步骤。[在式(1)中,
PG代表
氨基的保护基,R1代表可被取代的C1到C6烷基或C3到C8环烷基。]