Identification of SD-0006, a potent diaryl pyrazole inhibitor of p38 MAP kinase

Article abstract of DOI:10.1016/j.bmcl.2010.02.047

Starting from an initial HTS screening lead, a novel series of C(5)-substituted diaryl pyrazoles were developed that showed potent inhibition of p38α kinase. Key to this outcome was the switch from a pyridyl to pyrimidine at the C(4)-position leading to analogs that were potent in human whole blood based cell assay as well as in a number of animal efficacy models for rheumatoid arthritis. Ultimately, we identified a clinical candidate from this substrate; SD-0006.

Full text of DOI:10.1016/j.bmcl.2010.02.047

Bioorganic & Medicinal Chemistry Letters 20 (2010) 2634–2638
Contents lists available at ScienceDirect
Bioorganic & Medicinal Chemistry Letters
journal homepage: www.elsevier.com/locate/bmcl
Identification of SD-0006, a potent diaryl pyrazole inhibitor of p38 MAP kinase
*
John K. Walker , Shaun R. Selness, Rajesh V. Devraj, Michael E. Hepperle, Win Naing, Huey Shieh,
Ravi Kurambail, Syaulan Yang, Daniel L. Flynn, Alan G. Benson, Dean M. Messing, Tom Dice, Tina Kim,
R. J. Lindmark, Joseph B. Monahan, Joseph Portanova
Pfizer Global Research and Development, Chesterfield Parkway West, St. Louis, MO 63017, USA
a r t i c l e i n f o
a b s t r a c t
Article history:
Starting from an initial HTS screening lead, a novel series of C(5)-substituted diaryl pyrazoles were devel-
Received 12 January 2010
Revised 10 February 2010
Accepted 10 February 2010
Available online 14 February 2010
oped that showed potent inhibition of p38a kinase. Key to this outcome was the switch from a pyridyl to
pyrimidine at the C(4)-position leading to analogs that were potent in human whole blood based cell
assay as well as in a number of animal efficacy models for rheumatoid arthritis. Ultimately, we identified
a clinical candidate from this substrate; SD-0006.
Ó 2010 Elsevier Ltd. All rights reserved.
Dedicated to the memory of Joseph
Portanova a gifted scientist and valued
colleague.
Keywords:
p38 Kinase
Diaryl pyrazoles
Inhibitors
Rheumatoid arthritis
SD-0006
Tumor necrosis factor-a
The advent of biologic agents such as EnbrelÒ and RemicadeÒ
represent a significant advance in the treatment of auto-immune
disorders such as rheumatoid arthritis (RA).1 These agents work
via regulating levels of pro-inflammatory cytokines such as tumor
was found to be a moderately potent inhibitor of p38a
(IC50 = 600 nM). The X-ray crystal structure of 2 bound in the p38
active site revealed several important features important in guid-
ing our design of new analogs (Fig. 2).7 The pyridine nitrogen forms
a hydrogen bond with the backbone N–H of Met-109. The fluoro-
phenyl group, at the C(2)-position, occupied a lipophilic pocket lo-
cated past the gate keeper residue, Thr-106. The pyrazole ring
nitrogen was engaged in a water mediated hydrogen bond with
Asp-168. Further inspection of 2 bound in the ATP binding site sug-
gested the potential to build off the C(5) position and possibly en-
gage either the Asp-112 or Asp-113 which are located near solvent
exposed space. Alternatively, we envisioned that building towards
solvent space would also allow us to incorporate substituents that
would provide a handle to improve physical chemical properties.
The earlier report dealt with attempts to optimize 2 via prepa-
ration of the N-linked piperazine scaffold 3, where X = halogen, as a
handle to build off of towards the Asp-112. While these com-
pounds showed early promise we prosecuted several alternate
scaffolds, in parallel, that could project the desired moieties to-
wards the solvent exposed space. Of particular interest were the
related C-linked piperidine scaffolds of 4 and 5 (see Fig. 3). The
piperidines were considered to possess a number of desirable attri-
butes including that they lacked one of the basic nitrogens and
they possessed a flexible and efficient synthesis allowing for easy
necrosis factor-a (TNF-a) and interleukin-1B (IL-1B) and their
effectiveness validates targeting these pro-inflammatory cytokines
for therapeutic benefit.2 However, even with the introduction of
the biological agents there remains an increasing need to develop
orally available small molecule agents that target the pathways
leading to pro-inflammatory cytokine production. The mitogen
activated protein kinase (MAPK) p38 has been shown to play a crit-
ical role in cell signaling pathways which lead to the production of
both TNF-
a
and IL-1B.3,4 As a result, p38 represents an attractive
candidate for intervention to block biosynthesis of these pro-
inflammatory cytokines. Herein we describe the synthesis and
medicinal chemistry efforts that led to the identification of our re-
cently disclosed clinical candidate SD-0006,5 (1), which is a potent
inhibitor of p38 (Fig. 1).
Recently it was reported from these labs the identification of
high-throughput screening lead, diaryl pyrazole SC-102, (2)6 which
* Corresponding author. Tel.: +1 636 247 8895.
E-mail address: jkwalker24@sbcglobal.net (J.K. Walker).
0960-894X/$ - see front matter Ó 2010 Elsevier Ltd. All rights reserved.
doi:10.1016/j.bmcl.2010.02.047

J. K. Walker et al. / Bioorg. Med. Chem. Lett. 20 (2010) 2634–2638
2635
Table 1
H
N
H
p38 inhibition data for a set of nipecotate and isonipecotate derived pyrazoles
N
O
N
H
N
N
R
N
H
OH
N
N
N
F
Cl
N
N
SC-102 (2)
SD-0006 (1)
F
N
Figure 1. Previously disclosed diaryl pyrazole p38 inhibitors.
#
R
p38aa,b
p38ba,b
rLPS % inha,c,d
6
7
H
Me
48.3
90.0
404
2520
53
63
H
N
N
N
R
F
N
8
9
10
11
Ac
H
Me
Ac
281.0
25.3
54.7
82.0
1680
510
1960
2770
ND
2
77
41
ND = not determined.
a
For experimental conditions see Ref. 5.
IC50’s reported in nM.
Dosed at 5 mpk, 4 h prior to administration of LPS.
b
c
d
%reduction in TNFa levels measured 1.5 h after LPS stimulation.
Figure 2. Overlay of the lipophilic surface area of 2 bound in the active site of p38.
The second important distinguishing criteria for compound
selection was efficacy in an acute rat model of inflammation. We
chose to utilize a rat lipopolysaccharide (LPS) model5,10 to give
us a basic readout on in vivo efficacy. This model was relatively
high-throughput and provided us flexibility with regard to dose
and time course which provided an excellent tool to interrogate
compounds.
Table 1 highlights a representative data set for analogs prepared
in both the 3- and 4-piperidinyl scaffolds. The 3-piperidinyl ana-
logs (6–8) all demonstrated good potency relative to 2 with only
the acetamide, 8, having an IC50 >100 nM. Compounds 6 and 7 also
showed moderate efficacy in the LPS model of inflammation (53%
and 63%, respectively) with small to modest selectivities against
the p38 b-isoforms ranging from only 6–28-fold. The 4-piperidinyl
preparation of analogs that could be modified at all three positions
of the pyrazole.
At the outset of our effort we planned to focus on two major cri-
teria in assessing compounds. The first of these was p38
and selectivity vs the b-isoform. While four p38 isoforms are
known to exist, p38 , p38b, p38 and p38d, it was the - and b-iso-
forms that we were concerned with. The major driver in the im-
mune response was demonstrated to be p38 while the role of
p38b was less well understood,8 but because of it’s closely related
homology to p38 we considered it desirable to spare this isoform
a potency
a
c
a
a
a
as much as possible for general safety considerations. Unfortu-
nately at the time we undertook this work there was limited
analogs were also potent against p38a being slightly better when
understanding of the differences between
was driven largely by empirical means.9
a and b and our strategy
compared directly to their 3-piperidinyl counterparts (6 vs 9, 7
vs 10, 8 vs 11). Additionally, their selectivities against p38b were
also modestly superior ranging from 20- to 35-fold. While com-
pound 9 showed little efficacy (ꢀ2%) in the rLPS model and acet-
amide 11 had modest inhibition (41%) the basic N-methyl analog
10 possessed good activity (77%). In addition to the good activity
displayed by the basic analogs 7 and 10, we were also encouraged
to find that neutral analog 11 also possessed modest activity as
well suggesting the SAR would tolerate both basic and neutral
substituents.
H
N
N
N
N
R
X
N
4
Based on a slightly better a/b selectivity profile and because it
lacks the chiral center associated with the 3-piperidyl ring we
elected to focus primarily on the 4-piperidinyl scaffold. We next
turned our attention to optimization of the C(3)-aryl ring. The crys-
tal structure had indicated the 4-fluorophenyl group resided in a
large lipophilic pocket. We prepared a number of analogs looking
to optimize this lipophilic interaction. We surveyed this SAR by
selecting single point variations of compound 10 focusing on small
lipophilic R groups at either the para- and meta-positions with a
representative set highlighted in Table 2.
R
N
H
N
H
N
N
N
N
R
X
X
N
N
5
6
In general, we found most small lipophilic groups at either the
Figure 3. Switch from C(5)-piperazine to C(5)-piperidines
3- or 4-position to be well tolerated, with p38a IC50’s typically

2636
J. K. Walker et al. / Bioorg. Med. Chem. Lett. 20 (2010) 2634–2638
Table 2
O
O
O
SAR for the C(3)-phenyl substituent
a, b
HO
H
N
N
O
N
NH
N Me
O
NBoc
d, e, f
19
18
R
N
O
O
#
R
p38aa,b
p38ba,b
% inh rLPSa,c,d
c
O
+
10
12
13
14
15
16
17
4-F
4-Cl
3-Cl
4-CF3
3-CF3
4-Me
3-Me
54.7
31.6
39.2
40.5
26.5
99.6
67.3
1960
2680
1050
3770
164
41
71
27
22
6
N
R
R
20
N
21
3070
2350
44e
81e
NH
N
a
b
c
NH
N
For experimental conditions see Ref. 5
IC50’s reported in nM.
Unless otherwise noted dosed at 5 mpk, 4 h prior to administration of LPS.
%reduction in TNFa levels measured 1.5 h after LPS stimulation.
Dosed at 20 mpk.
g, h
NBoc
N
R
d
e
R
N
N
22
<100 nM. Replacement of the fluorine atom with chlorine resulted
in an analog, 12, with similar p38 potency but possessing a two-
fold improvement in the b/ selectivity ratio (84 vs 35) as com-
pared to 10. The trend of greater b/ selectivity for the
compounds bearing a para-substituent relative to meta-substitu-
tion was consistent within this series and resulted from com-
pounds with para-substituents having less affinity for the b-
isoform. More importantly, however, was fact that this improve-
ment in selectivity was achieved without any loss of in vivo effi-
cacy as judged by the rLPS model (71% for 12 vs 77% for 10).
Compound 13, where the chlorine substituent was in the 3-posi-
23
a
Scheme 1. General synthesis of the diarylpyrazole scaffold. Reagents and condi-
tions: (a) NaOH, (BOC)2O, dioxane, 85%; (b) n-hydroxysuccinimide, EDC, DMAP,
CH2Cl2, 90%; (c) LiHMDS, 0 °C, 4-methylpyridine, 30 min then add benzoic ester,
90–95%; (d) tBuOK, THF, 0 °C, 1 h then add 19; (e) AcOH; (f) H2NNH2, 15–35%; (g)
4 N HCl-dioxane; (h) H2CO, HCO2H.
a
a
potency on p38
a and good efficacy in the LPS model at the
5 mpk dose but displayed a significant loss in efficacy at the
1 mpk dose. Glycine derivative, 29, failed to achieve efficacy in
the LPS model (20% inh @ 5 mpk). Acetamide derivative 30 was
moderately efficacious, at 5 mpk, in the rLPS model but also suf-
fered a substantial loss in efficacy at the low dose. We also pre-
tion was also potent against p38a but demonstrated poor efficacy
in the rLPS model. The larger more lipophilic trifluoromethyl moi-
ety in either the 3- or 4-position (compounds 14 and 15) yielded
analogs potent against p38
a
but with poor efficacy in the LPS mod-
pared a set of amides derivatives bearing additional polar
el. The 3-methylphenyl compound 17 did show good efficacy (81%)
in the LPS model, albeit at a higher dose of 20 milligrams per kilo-
gram (mpk) but as noted above it also possessed reduced selectiv-
functionality (30–33) including some to mimic compounds such
as 24 and 25. In general, these analogs displayed good potency
for p38a and where highly efficacious in the LPS model at the
ity for p38
a
while the corresponding 4-methyl analog (16)
5 mpk dose. Compounds 31 and 32 were particular attractive as
they did not suffer any drop off in efficacy at the 1 mpk dose
(76% and 85% inh, respectively). Amide 33 however suffered a com-
plete loss of activity at 1 mpk. In general, selectivities for the amide
derivatives ranged 16–80X with only 31 showing a b/a ratio signif-
icantly <50 (16X). We also profiled these analogs in a cell-based
possessed selectivity and rLPS efficacy comparable to compound
10. Based on the in vivo efficacy and better selectivity against
p38b, we elected to fix the 4-chlorophenyl group at the C(3)-posi-
tion and turned our attention next to optimization of the N-substi-
tuent on the piperidine ring.
Scheme 1 depicts the general synthetic scheme we employed
for the synthesis of our diaryl pyrazole analogs. Starting with ison-
ipecotic acid (18) conversion to the protected n-succinimyl acid es-
ter, 19, was achieved in two steps. In parallel, the pyridyl phenyl
ketones of type 21 were obtained via reaction of the anion of 4-
methylpyridine and the appropriately substituted benzoates es-
ters, 20. Ketone 21 was subsequently deprotonated with potassium
tertbutoxide and allowed to react with 19 to give a 1,3-diketone
intermediate which upon further exposure to hydrazine followed
by acidic work-up yielded the desired pyrazole 22. Finally, removal
of the Boc group yields the free amine which can then be appropri-
ately substituted to yield the desired compounds.
human whole blood (HWB) assay. Following stimulation with
LPS, compounds were evaluated for their ability to block TNF-
a
production. The analogs derived from alkyl substitution, where
the piperidine nitrogen remains basic, generally gave potencies
in the sub-micromolar range in the HWB assay. Analogs with neu-
tral substitution, however, typically gave potencies in the low
micromolar range.
A set of potentially promising compounds from Tables 2 and 3
were further profiled further in a series of assays to better assess
their overall drugability (Table 4). The compounds were evaluated
an in vitro human liver microsome assay (HLM) to assess potential
metabolism issues, a dofetilide competition binding assay for
assessing potential CV safety risks and the mouse collagen induced
arthritis (CIA) model to assess efficacy in a chronic inflammation
model.10 The more basic alkyl substituted analogs such as 11, 24
and 25 were found to have high intrinsic clearances in the HLM as-
say and >50% inhibition in the dofetilide assay. Following this re-
sult analog 11 was further examined in a hERG patch clamp
assay and found to be reasonably potent (IC50 = 790 nM) on the
hERG channel. Compounds 11 and 25 did, however, exhibit efficacy
in the chronic CIA model. After 21 days of dosing only a 22%
With the C(3)-position now fixed we set about optimization of
the piperidine ring to probe the solvent exposed space and/or en-
gage Asp-112. A number of alkyl and amide derived substitutions
were examined. The simple hydroxy substituted alkyl groups
(24–26) were potent and selective p38a inhibitors with roughly
100Â selectivity over b. Compounds 24 and 25 were also very po-
tent in the rLPS model (dosed @ 5 mpk) with 24 further distin-
guishing itself by maintaining efficacy at a lower dose (72% inh @
1 mpk). Sulfonyl urea, 27 and sulfonamide 28 both showed good

J. K. Walker et al. / Bioorg. Med. Chem. Lett. 20 (2010) 2634–2638
2637
Table 3
CO2Et
NH
SAR for the piperidine substituent
O
N
N
N
H
N
a, b
N
c
N
N R
NBoc
NBoc
N
34
N
35
N
Cl
36
N
p38aa,b p38ba,b
HWBa,c
% inh rLPSa,c,d (mpk)
d, e, f
#
R
24
25
26
27
28
29
30
31
32
33
–CH2CH2OH
–CH2CH2OMe
–CH2(CH2)2OMe
–SO2NH2
–SO2Me
–CH2CO2H
41
70
106
14
70
126
68
111
71
80
3390
6720
6550
1650
3530
4340
3130
1790
3450
6720
120
520
ND
ND
820
ND
3600
1500
3500
10,100
88(5); 72(1)
84(5); 56(1)
ND
68(5); 21(1)
75(5); 45(1)
20(5)
66(5); 32(1)
85(5); 76(1)
90(5);85(1)
85(5); 0(1)
NH
N
NH
N
N
g or h
N
R
N
N
Cl
Cl
–C(O)CH3
–C(O)CH2OH
–C(O)CH2OMe
–C(O)CH2NMe2
N
N
38
37
Scheme 2. Synthesis of C(4)-pyrimidine analogs. Reagents and conditions: (a)
LiHMDS, THF, 0 °C; (b) add ethyl N-Boc-piperidine-4-carboxylate, 70%; (c)
EtCO2NHNH2; EtOH, ACOH; (d) LiHMDS, 0 °C, 30 min, add 4-chloro benzoylchloride,
1 h; (e) Add 4 N HCl-dioxane; (f) 2 N NaOH; (g) R-CHO, Na(OAc)3BH, CH2Cl2 or; (h)
R-CO2H, EDC, DMAP, Hunig’s base, CH2Cl2.
ND = not determined.
a
For experimental conditions see Ref. 5.
IC50’s reported in nM.
Specified dose given 4 h prior to administration of LPS.
b
c
d
%reduction in TNFa levels measured 1.5 h after LPS stimulation.
that for the pyridine scaffold. Starting with 4-methyl pyrimidine,
(34), ketone 35 already incorporating the C(5)-piperidine ring
was prepared via acylation of the anion of 34 with the Boc-pro-
tected ethyl isonipecotate in two steps in a 70% overall yield. Next,
ketone 35 was condensed with ethyl carbazate to give hydrazone
36. Conversion of 36 to pyrazole 37 was achieved in three steps
via (1) dianion formation of 36 followed by acylation with 4-chloro
Table 4
Additional data for select C(4)-pyridyl compounds
Dofb (% inh)
mCIAc (% inc)
a
Compd #
Clint (T1/2
)
11
24
25
30
31
62.3(16.6 min)
32.0 (30.5 min)
47.7(21.5 min)
22.5 (43.3 min)
15.8 (62 min)
64
61
74
ND
24
38
70
22
50
60
benzoylchloride to give a
a-acyl hydrazide, (2) formation of the
pyrazole ring via exposure to 4 N HCl-dioxane, (3) base catalyzed
removal of the carboethoxy group which gave rise to the desired
pyrazole scaffold, 37. The desired N-alkyl substituted analogs were
then prepared through a standard reductive amination protocol
while the amide compounds were prepared using a standard
amide coupling procedures or via addition and subsequent ring
opening of the appropriate epoxides.
Table 5 highlights enzyme binding, HWB and LPS data for a rep-
resentative set of pyrimidine analogs. As seen previously in the
C(4)-pyridine series the methyl piperidine, 39, was potent on
ND = not determined.
a
Human liver microsomes with clearance measured in ml/min/kg.
Test concentration was 10
Mice were dosed at 30 mpk and disease measured after 21 days.
b
c
lM.
incidence of disease was observed with 25, as measured by amount
of paw swelling relative to control animals. The neutral amide ana-
logs 30 and 31 were also evaluated. The compounds showed mod-
erate intrinsic clearance in the HLM assay and markedly reduced
effect in the dofetilide assay. In their respective mCIA studies both
30 and 31 gave only modest responses (50% and 60% incidence).
Despite identifying several promising compounds in terms of
potency, selectivity and in vivo efficacy within this series some is-
sues were also identified which needed to be addressed going for-
ward. While it was readily apparent that piperidine analogs
derived from alkyl substituents were potent in the cell and effica-
cious in vivo they also tended to have higher clearance in our HLM
model and also posed a potential CV safety risk. Replacing the alkyl
groups with amide substituents tended to mitigate both the clear-
ance and safety risks but these analogs also tended to be less po-
tent in both the cell and in vivo relative to the basic compounds.
Previously, work done by researchers at Smithkline Beecham had
demonstrated that for a related chemical template replacement
of a pyridine group with pyrimidine had resulted in a boost in po-
tency.11 We envisioned that such a replacement of the C(4)-pyridyl
moiety with a pyrimidine ring as a potential approach to improv-
ing efficacy for the neutral analogs. Additionally, this switch would
reduce the lipophilicity of the scaffold and thus might also help ad-
dress issues around clearance and/or safety for the basic analogs.
With this in mind, we turned our attention to preparing a series
of pyrazole analogs with a C(4)-pyrimidyl ring.
p38a but only moderately effective in the rLPS model. As before,
we prepared a number of alkyl substituted piperidines bearing a
heteroatom in the alkyl chain (40–45). Simple aminoalcohol 40
was potent on p38a and in the HWB assay as well as being effica-
cious at both 5 and 1 mpk in the rLPS model. Adding methyl groups
to the alkyl chain of 40 proved ineffective as we saw greatly dimin-
ished efficacy in the rLPS model with these compounds (41 and
42). The furanyl analog, 43, was potent on p38a and in the HWB
assay. Similar to 40 it also maintained efficacy in the rLPS model
at the 1 mpk dose. Pyranyl compound, 44, however was less potent
on p38a (IC50 = 205 nM) and had only modest efficacy at 5 mpk in
the rLPS model. Cyclopentyl alcohol, 45, was one of the most po-
tent compounds measured in the p38 activity assay but was unable
to maintain efficacy (40%) in the rLPS model at a 1 mpk dose. Pyr-
idine derivative, 46, failed to achieve good rLPS efficacy at even the
5 mpk dose. In general, the neutral analogs were still less potent on
p38a than the corresponding basic analogs, but still worked well in
the LPS model. Acetamide 47 was only moderately potent on p38
a
(IC50 = 152 nM) but was still efficacious in the rLPS model at both
the 1 and 5 mpk doses (90% and 72%). The glycolate derived amides
(1 and 48) behaved similarly to 47 in both models with 1 having
the best efficacy in the LPS model at 1 mpk (81%). Urea 49 and sul-
fonamide 50 were both potent analogs that also showed a drop in
efficacy in rLPS when dosed at 1 mpk. As seen previously in the
Scheme 2 depicts the synthesis devised for the pyrimidine scaf-
fold which in turn proved more efficient and higher yielding than

2638
J. K. Walker et al. / Bioorg. Med. Chem. Lett. 20 (2010) 2634–2638
Table 5
Table 7
Data for pyrimidine analogs
Selected pharmacokinetic parameters for compound 1
Speciesa
Cl (ml/min/kg)
Vd (L/kg)
T1/2 (h)
H
N
N
Ratb
4.96
2.92
1.74
1.07
4.05
4.48
N R
Dogc
N
a
b
c
Compounds were dosed intraveniously (IV) at the specified doses.
5 mg/kg dose.
2.5 mg/kg dose.
Cl
N
#
R
p38aa,b p38ba,b HWBa,b rLPS % inh dosea,c,d (mpk)
39 –CH3
48
35
2320
2540
800
490
63(5); 36(1)
88(5); 80(1)
Additional profiling data of select pyrimidyl compounds from
OH
40
above are shown in Table 6. A consistent trend we observed was
that the intrinsic clearance (Clint) was lower for the pyrimidyl ser-
ies versus the pyridyl series. Most notable was the 50% reduction in
Clint observed with 39 (31.5 vs 62.3 ml/min/kg) compared to C(4)
pyridyl analog 11. The other basic analogs 40 and 43 also saw
reductions in intrinsic clearance when compared to their respec-
tive pyridine versions. This trend also was observed with the neu-
tral analogs such as 1 and 50. The switch to pyrimidine also
diminished the potential for crossover on the hERG channel as
measured by the dofetilide binding assay. Reductions in competi-
tive binding were observed with all pyrimidine analogs as com-
pared to their pyridyl versions. Neutral compounds such as 1 and
50 were significantly less active than the basic analogs. Finally,
compounds 39 and 1 showed a significant reduction in incidence
in the mCIA model. Compound 1 showed the greatest efficacy in
the model with only 16% incidence of disease at a 30 mpk dose
(administered 15 mpk bid). Additionally, 1 showed excellent met-
abolic stability as measured by the HLM assay with a T1/2 of >2 h.
Finally, pharmacokinetic experiments (Table 7.) in both the dog
and rat indicated compound 1 possessed desirable properties in
terms of half-life (rat and dog t1/2 = 5–6 h) with bioavailabilities
>80% in both species. On the basis of the data presented here as
well as previously disclosed data,5 compound 1 was selected for
advancement to clinical trials.
OH
OH
41
42
43
184
88
2780
9780
7410
ND
1000
520
0(5); ND(1)
34(5); 3(1)
31
70(5); 80(1)b
O
44
205
19
9500
3380
>5000
ND
46(5); ND(1)
70(5); 40(1)
O
OH
45
46
N
47
3290
3710
ND
ND
27(5); ND(1)
90(5); 72(1)
O
47
152
O
1
110
94
3450
3250
1500
ND
87(5); 81(1)
88(5); 71(1)
OH
O
48
OMe
O
49
88
3480
4100
ND
88(5); 53(1)
89(5); 26(1)
N
O
S
O
50
198
>5000
ND = not determined.
References and notes
a
For experimental conditions see Ref. 5
IC50’s reported in nM.
Specified dose given 4 h prior to administration of LPS.
b
c
1. Vaz, A.; Lisse, J.; Rizzo, W.; Albani, S. Expert Rev. Clin. Immunol. 2009, 5, 291.
2. Taylor, P. C.; Feldman, M. Nat. Rev. Rheumatol. 2009, 5, 578.
3. Westra, J.; Limburg, P. C.; de Boer, P.; van Rijswijk, M. H. Ann. Rheum. Dis. 2004,
63, 1453.
d
%reduction in TNFa levels measured 1.5 h after LPS stimulation.
4. Schett, G.; Zwerina, J.; Firestein, G. Ann. Rheum. Dis. 2008, 67, 909.
5. Burnette, B. L.; Selness, S. R.; Devraj, R.; Jungblath, G.; Kurambail, R.; Stilwell, L.;
Anderson, G.; Mnich, S.; Hirsch, J.; Compton, R.; De Ciechi, P.; Hope, H.;
Hepperle, M.; Keith, R. H.; Naing, W.; Shieh, H.; Portanova, J.; Zhang, Y.; Zhang,
J.; Leimgruber, R. M.; Monahan, J. Pharmacology 2009, 84, 42.
Table 6
Additional data for select C(4)-pyrimidyl compounds
6. Graneto, M. J.; Kurambail, R. G.; Vazquez, M. L.; Shieh, H.; Pawlitz, J. L.;
Williams, J. M.; Stallings, W. C.; Geng, L.; Naraian, A. S.; Koszyk, F. J.; Stealey, M.
A.; Xu, X. D.; Weier, R. M.; Hanson, G. J.; Mourey, R. J.; Compton, R. P.; Mnich, S.
J.; Anderson, G. D.; Monahan, J. B.; Devraj, R. J. Med. Chem. 2007, 50, 5712.
7. The coordinates have been deposited in the PDB under accession code 1BL7.
8. (a) Hale, K. K.; Trollinger, D.; Rihanek, M.; Manthey, C. L. J. Immunol. 1999, 162,
4252; (b) O’Keefe, S. J.; Mudgett, J. S.; Cupo, S.; Parsons, J. N.; Chartrain, N. A.;
Fitzgerald, C.; Chen, S.-L.; Lowitz, K.; Rosa, C.; Visco, D.; Luell, S.; Carballo-Jane,
E.; Owens, K.; Zaller, D. M. J. Biol. Chem. 2007, 282, 34663.
Compd #
Clint (T1/2
)
Dofb (%inh)
mCIAc (%inc)
a
39
40
43
47
1
31.5 (31.2 min)
21.4 (47.6 min)
16.3 (61.3 min)
9.5 (102 min)
<8 (>120 min)
18.1 (53.9 min)
51
46
35
ND
16
ND
20
61
50
50
16
44
50
9. (a) For a recent review on p38 selectivity see, Goldstein, D. M.; Kuglstatter, A.;
Lou, Y.; Soth, M. J. J. Med. Chem. 2010, ASAP.; (b) For recent work on defining the
active site of p38b see Patel, S. B.; Cameron, P. M.; O’Keefe, S. J.; Frantz-Wattley,
B.; Thompson, J.; O’Neill, E. A.; Tennis, T.; Liu, L.; Becker, J. W.; Scapin, G. Acta
Crystallogr., Sect. D: Biol. Crystallogr. 2009, D65, 777.
ND = not determined.
a
Human liver microsomes with clearance measured in ml/min/kg.
b
c
Test concentration was 10
lM.
Mice were dosed at 30 mpk and disease measured after 21 days.
10. (a) The Pfizer Institutional Animal Care and Use Committee reviewed and
approved the animal use in these studies. The animal care and use program is
fully accredited by the Association for Assessment and Accreditation of
Laboratory Animal Care, International. (b) For experimental conditions
around this model please refer to Ref. 5
11. Adams, J. L.; Boehm, J. C.; Kassis, S.; Gorycki, P. D.; Webb, E. F.; Hall, R.;
Sorenson, M.; Lee, J. C.; Ayrton, A.; Griswold, D. E.; Gallagher, T. F. Bioorg. Med.
Chem. Lett. 1998, 8, 3111.
pyridine scaffold the basic analogs performed well in the HWB as-
say while the neutral analogs were typically in the low micromolar
range.