The present invention relates to a method for the preparation of citalopram comprising reaction a compound of formula (I)
1
with a compound having the formula
2
wherein X is a suitable leaving group and R is —CH
2
—O—Pg, —CH
2
—NPg
1
P
g2
, —CH—N(CH
3
)
2
, —CH(OR
1
)(OR
2
) —C(OR
4
)(OR
5
)(OR
6
), —COOR
3
, —CH
2
—CO—NH
2
, —CH═CHR
7
and —CONHR
8
, wherein Pg is a protection group for an alcohol group, Pg
1
and Pg
2
are protection groups for an amino group, R
1
and R
2
are independently selected from alkyl, alkenyl, alkynyl and optionally alkyl substituted aryl or aralkyl groups or R
1
and R
2
together form a chain of 2 to 4 carbon atoms, each of R
3
, R
4
, R
5
, R
6
and R
7
are independently selected from alkyl, alkenyl, alkynyl and optionally alkyl substituted aryl or aralkyl and R
8
is hydrogen or methyl;
to form a compound of the formula
3
wherein R is as defined above; followed by conversion of the group R to form a dimethylaminomethyl group and isolation of citalopram base or a pharmaceutically acceptable salt thereof.
本发明涉及一种制备
西酞普兰的方法,包括将式(I)的化合物1与具有式2的化合物反应,其中X是适当的离去基团,R是—
CH2—O—Pg,— —NPg1Pg2,—CH—N(
CH3)2,—CH(OR1)(OR2)—C(OR4)(OR5)(OR6),—COOR3,— —CO—NH2,—CH═CHR7和—CONHR8,其中Pg是羟基保护基团,Pg1和Pg2是
氨基保护基团,R1和R2分别选择烷基,烯基,炔基和可选的烷基取代的芳基或芳基烷基,或R1和R2共同形成2至4个碳原子的链,R3、R4、R5、R6和R7各自独立选择烷基,烯基,炔基和可选的烷基取代的芳基或芳基烷基,R8是氢或甲基;形成式3的化合物,其中R如上所述;随后将基团R转化为
二甲氨基甲基基团并分离
西酞普兰碱或其药学上可接受的盐。