申请人:Dipharma Francis S.r.l.
公开号:EP2067768A1
公开(公告)日:2009-06-10
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 R1-OH, wherein R1 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)通过在溶剂式R1-OH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的定义如本文所述。