Alkylation of 2-lithio-N-methylpiperidines and -pyrrolidines: scope, limitations, and stereochemistry
摘要:
The scope and limitations of the alkylation of racemic and nonracemic 2-lithiopiperidines and -pyrrolidines, obtained by transmetalation of the corresponding stannanes, is reported. These organolithiums react with a variety of electrophiles to afford 2-substituted pyrrolidines and piperidines in excellent yield. With primary alkyl halides the reaction proceeds with net inversion of configuration at the metal-bearing carbon in the piperidines; in the pyrrolidines there is a mixture of inversion and retention, with the former predominating. With most carbonyl electrophiles (carbon dioxide, dimethyl carbonate, methyl chloroformate, pivaloyl chloride, benzaldehyde, and dialkyl ketones), retention is observed in both cases. Electrophiles such as benzophenone, benzyl bromide, and tert-butyl bromoacetate afford racemic coupling products. A mechanistic interpretation is presented.
The present invention is directed to novel compounds, to a process for their preparation, their use in therapy and pharmaceutical compositions comprising the novel compounds.
本发明涉及新化合物,以及用于它们的制备的方法,它们在治疗中的应用以及包含这些新化合物的药物组合物。
Synthesis and SAR Studies of diarylpyrrole anticoccidial agents
作者:Xiaoxia Qian、Gui-Bai Liang、Dennis Feng、Michael Fisher、Tami Crumley、Sandra Rattray、Paula M. Dulski、Anne Gurnett、Penny Sue Leavitt、Paul A. Liberator、Andrew S. Misura、Samantha Samaras、Tamas Tamas、Dennis M. Schmatz、Matthew Wyvratt、Tesfaye Biftu
DOI:10.1016/j.bmcl.2006.01.041
日期:2006.5
pyrroles were prepared and evaluated as anticoccidialagents in both in vitro and in vivo assays. Among the compounds evaluated, the dimethylamine-substituted pyrrole 19a is the most potent inhibitor of Eimeria tenella PKG (cGMP-dependent protein kinase). Further SAR studies on the side chain of the 2-pyrrolidine nitrogen did not enhance in vivo anticoccidial activity.
Disclosed are methods for treating Alzheimer's disease, and other diseases, and/or inhibiting beta-secretase enzyme, and/or inhibiting deposition of A beta peptide in a mammal, by use of hydrazine compounds of formula (I) wherein the variables R
1
-R
9
are defined herein.
2-PROPYNYL ADENOSINE ANALOGS HAVING A2A AGONIST ACTIVITY AND COMPOSITIONS THEREOF
申请人:Linden M. Joel
公开号:US20070232559A1
公开(公告)日:2007-10-04
The invention provides compounds having the following general formula (I):
wherein X, R
1
, R
2
, R
7
and Z are as described here.
该发明提供具有以下一般式(I)的化合物:其中X,R1,R2,R7和Z如此描述。
Vasopressin V1a Antagonists
申请人:Batt Andrzej Roman
公开号:US20090029965A1
公开(公告)日:2009-01-29
The present invention concerns compounds inter alia according to general formula 1
a
. Compounds according to the invention are vasopressin V
1a
receptor antagonists. Pharmaceutical compositions of the compounds are useful as treatment of dysmenorrhoea.