First Example of <i>s</i>-BuLi/(-)-Sparteine-Mediated Chiral Deprotonation of a Piperazine and Proof of the Sense of Induction
作者:Benjamin McDermott、Andrew Campbell、Anne Ertan
DOI:10.1055/s-2008-1042905
日期:2008.4
deprotonation of a piperazine. Reaction of TERT-butyl 4- TERT-butylpiperazine-1-carboxylate with S-BuLi in the presence of (-)-sparteine at -78 °C and quenching with carbon dioxide proceeded in good yield and with a high degree of selectivity (er = 89:11). X-ray crystal structureanalysis on a chiral derivative confirmed the R-enantiomer was the majorproduct. This methodology was employed as a route to an
本文描述了 (-)-sparteine 介导的哌嗪不对称去质子化的第一个已知例子。4-叔丁基哌嗪-1-羧酸叔丁酯与 S-BuLi 在 (-)-sparteine 存在下在 -78 °C 和用二氧化碳淬灭的反应以良好的产率和高选择性(er = 89:11)。手性衍生物的 X 射线晶体结构分析证实 R-对映异构体是主要产物。该方法被用作高级手性中间体的途径,该中间体用于平行合成一系列具有药用价值的分子。还描述了用于将叔丁基引入哌嗪氮的化学优化。
The present invention relates to compounds of formula (I)
The compounds act via antagonism of the CCR2b receptor and may be used to treat inflammatory disease and/or neuropathic pain.
Compounds of formula (I) Q-L-W—C(═X)-Z-P wherein Q is an amine of the formula —N(R
1
)(R
2
); L is an alkyl or heterocyclyl-alkyl linker; W is a 6- or 7-membered aliphatic ring comprising ring atoms Y
1
and Y
2
which are linked to groups L and C(X) respectively and Y
1
and Y
2
are independently selected from N and C; X is O, N, N—CN or S; Z is NR
3
; P is an optionally substituted monocyclic or bicyclic aryl or heteroaryl group; and pharmaceutically acceptable salts or solvates thereof, are useful in the treatment of C-C chemokine mediated conditions.
Compounds of formula (I)
Q-L-W—C(═X)—Z—P
wherein
Q is an amine of the formula —N(R
1
)(R
2
);
L is an alkyl or heterocyclyl-alkyl linker;
W is a 6- or 7-membered aliphatic ring comprising ring atoms Y
1
and Y
2
which are linked to groups L and C(X) respectively and Y
1
and Y
2
are independently selected from N and C;
X is O, N, N—CN or S;
Z is NR
3
;
P is an optionally substituted monocyclic or bicyclic aryl or heteroaryl group;
and pharmaceutically acceptable salts or solvates thereof,
are useful in the treatment of C—C chemokine mediated conditions.
Compounds of formula (I)
Q-L-W—C(═X)—Z—P
wherein
Q is an amine of the formula —N(R
1
)(R
2
);
L is an alkyl or heterocyclyl-alkyl linker;
W is a 6- or 7-membered aliphatic ring comprising ring atoms Y
1
and Y
2
which are linked to groups L and C(X) respectively and Y
1
and Y
2
are independently selected from N and C;
X is O, N, N—CN or S;
Z is NR
3
;
P is an optionally substituted monocyclic or bicyclic aryl or heteroaryl group;
and pharmaceutically acceptable salts or solvates thereof,
are useful in the treatment of C—C chemokine mediated conditions.