申请人:ANNIS GARY DAVID
公开号:US20090036686A1
公开(公告)日:2009-02-05
A method is disclosed for preparing a 2-substituted-5-oxo-3-pyrazolidinecarboxylate compound of Formula I
The method comprises contacting a succinic acid derivative of the formula R
1
OC(O)C(H)(X)C(R
2a
)(R
2b
)C(O)Y (i.e. Formula II) wherein X and Y are leaving groups and L, R
1
, R
2a
and R
2b
are as defined in the disclosure, with a substituted hydrazine of the formula LNHNH
2
(i.e. Formula III) in the presence of a suitable acid scavenger and solvent. Also disclosed is the preparation of compounds of Formula IV
wherein X
1
, R
6
, R
7
, R
8a
, R
8b
, R
9
, and n are as defined in the disclosure. Also disclosed is a composition comprising on a weight basis about 20 to 99% of the compound of Formula II wherein R
1
, R
2a
, R
2b
, R
3
, R
4
and R
5
are as defined in the disclosure; X is Cl, Br or I; and Y is F, Cl, Br or I; provided that when R
2a
and R
2b
are each H, and X and Y are each Cl then R
1
is other than benzyl and when R
2a
and R
2b
are each phenyl, and X and Y are each Cl, then R
1
is other than methyl or ethyl. Also disclosed is a crystalline composition comprising at least about 90% by weight of the compound of the formula R
1
OC(O)C(H)(X)C(R
2a
)(R
2b
)CO
2
H (i.e. Formula VI) wherein R
2a
and R
2b
are H, X is Br and R
1
is methyl.
本发明公开了一种制备式I的2-取代-5-氧代-3-吡唑烷羧酸酯化合物的方法,该方法包括将式II的琥珀酸衍生物与一种取代的式III的肼在合适的酸清除剂和溶剂的存在下接触。其中,X和Y是离去基团,L、R1、R2a和R2b如本文所定义。本发明还公开了制备式IV化合物的方法,其中X1、R6、R7、R8a、R8b、R9和n如本文所定义。本发明还公开了一种组合物,其包括按重量计约20至99%的式II化合物,其中R1、R2a、R2b、R3、R4和R5如本文所定义;X为Cl、Br或I;Y为F、Cl、Br或I;但当R2a和R2b都为H,且X和Y都为Cl时,R1不是苄基;当R2a和R2b都为苯基,且X和Y都为Cl时,R1不是甲基或乙基。本发明还公开了一种晶体组合物,其包括至少按重量计约90%的式VI的化合物,其中R2a和R2b为H,X为Br,R1为甲基。