A process for the preparation of a compound of formula (I),
comprising:
a) the reaction of a compound of formula (II)
with hydrazine to obtain a compound of formula (III),
b) the conversion of a compound of formula (III) by rearrangement via formation of nitrene/isocyanate, in a solvent of formula R
1
—OH, wherein R
1
is as herein defined, to obtain a compound of formula (IV);
c) the enantiomeric enrichment of a compound of formula (IV) to obtain the enantiomer (S) of a compound of formula (V)
d) the hydrolysis of a compound of formula (V).
一种制备式(I)化合物的方法,包括:a)将式(II)化合物与
肼反应,得到式(III)化合物;b)通过在式R1-OH的溶剂中发生亚硝基/
异氰酸酯的重排反应,将式(III)化合物转化为式(IV)化合物;c)对式(IV)化合物进行对映体富集,得到式(V)化合物的对映体(S);d)对式(V)化合物进行
水解。其中,R1如本文所定义。