Method for preparing cathine and cathine

The present invention relates to be used to prepare (1R, 2S) cathine and (1R, 2R) the method for cathine and its intermediate, 1 phenyl propanol of (R) 2 oximido is reduced to by Vector factors conversion 2 oximido, 1 phenylacetone of Radix Dauci Sativae wherein in first step reaction, (1R is reduced in 1 phenyl propanol of second step (R) 2 oximido, 2S) cathine and (1R, 2R) the mixture of cathine, split finally by chiral selectors (R) O acetyl mandelic acids are added, obtain optical voidness (1R, 2S) cathine and (1R, 2R) cathine monomeric compound.