A facile synthesis of pyrimidone derivatives and single-crystal characterization of pymetrozine

Article abstract of DOI:10.1080/00397911.2011.551869

A facile and efficient synthetic methodology for the preparation of aza-pyrimidone and beno-pyrimidone derivatives is described, in which the triazinone ring and dihydroquinazolin-2(1H)-one was convenient constructed. The structures of all the newly synthesized compounds were characterized by mass, ¹H NMR, and infrared spectroscopy. In additional, the crystal of pymetrozine was obtained to find useful information such as configuration and molecular action mechanisms.

Full text of DOI:10.1080/00397911.2011.551869

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A Facile Synthesis of Pyrimidone
Derivatives and Single-Crystal
Characterization of Pymetrozine
Baozhu Wang a , Shaoyong Ke a , Babu Kishore a , Xiaoyong Xu a ,
Zhuyan Zou a & Zhong Li a
a Shanghai Key Laboratory of Chemical Biology, School of Pharmacy,
East China University of Science and Technology, Shanghai, China
Available online: 28 Nov 2011
To cite this article: Baozhu Wang, Shaoyong Ke, Babu Kishore, Xiaoyong Xu, Zhuyan Zou & Zhong
Li (2012): A Facile Synthesis of Pyrimidone Derivatives and Single-Crystal Characterization of
Pymetrozine, Synthetic Communications: An International Journal for Rapid Communication of
Synthetic Organic Chemistry, 42:16, 2327-2336
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Synthetic Communications1, 42: 2327–2336, 2012
Copyright # Taylor & Francis Group, LLC
ISSN: 0039-7911 print=1532-2432 online
DOI: 10.1080/00397911.2011.551869
A FACILE SYNTHESIS OF PYRIMIDONE DERIVATIVES
AND SINGLE-CRYSTAL CHARACTERIZATION OF
PYMETROZINE
Baozhu Wang, Shaoyong Ke, Babu Kishore, Xiaoyong Xu,
Zhuyan Zou, and Zhong Li
Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East
China University of Science and Technology, Shanghai, China
GRAPHICAL ABSTRACT
Abstract A facile and efficient synthetic methodology for the preparation of aza-pyrimidone
and beno-pyrimidone derivatives is described, in which the triazinone ring and
dihydroquinazolin-2(1H)-one was convenient constructed. The structures of all the newly
1
synthesized compounds were characterized by mass, H NMR, and infrared spectroscopy.
In additional, the crystal of pymetrozine was obtained to find useful information such as
configuration and molecular action mechanisms.
Keywords Crystal; pymetrozine; pyrimidone; synthesis
INTRODUCTION
The regulation of insect feeding is only fragmentarily understood because of
the complexity of mechanisms that are under the control of internal and external sig-
nals. This insufficient understanding may in part be due to the lack of compounds
specifically that could interfere with insect feeding at critical steps.[1,2] To the best
to our knowledge, only 6-methyl-4-[(pyridin-3-ylmethylene)amino]-4,5-dihydro-1,
2,4-triazin-3(2H)-one (pymetrozine) and 1-propionyl-3- (pyridine-3-ylmethylamino)-
3,4-dihydroquinazolin-2(1H)-one (R-768) are novel types of antifeedant with an
Received October 25, 2010.
Address correspondence to Zhong Li, Shanghai Key Laboratory of Chemical Biology, School of
Pharmacy, East China University of Science and Technology, Shanghai, China. E-mail: lizhong@
ecust.edu.cn
2327

2328
B. WANG ET AL.
unknown biochemical mode of action.[3–6] The analogous structures of the two kinds
of compounds have attracted great interest.[7–9] It is well known that the high activity
of pymetrozine is attributed to the structure of pyrimidone moiety, but it is not clear
how it works. Kaufman and Kayser pointed that pymetrozine might act on some
target protein receptor,[10] so a functionalized pyrimidone moiety consequently has
attracted considerable synthetic interest. In this article, we describe a synthetic study
on aza-pyrimidone and beno-pyrimidone derivatives, in which the triazinone ring and
dihydroquinazolin-2(1H)-one were convenient constructed. In additional, cis-trans
isomerism in pesticide molecules is associated with structure–bioactivity relationship,
so we prepared the crystal of pymetrozine to realize the real configuration of these
aza-pyrimidone and beno-pyrimidone derivatives.
RESULTS AND DISCUSSION
The synthesis of aza-pyrimidone and beno-pyrimidone derivatives was conduc-
ted as shown in Scheme 1.[11]
Treatment of ethyl acetate 1 with hydrazine hydrate afforded acetohydrazide 2
(98.0% yield), which was cyclized with triphosgen to give the 5-methyl-1,3,4-
oxadiazol-2(3H)-one 3 (95.0% yield). After reaction with chloroacetone in the
presence of NaH (82.0% yield), ring-opening reaction and cyclization of the resulting
oxadiazole-3-acetone 4 with hydrazine hydrate gave trizone 5 in 87.0% yield. In the
synthesis of compound 5, the molar ratio of hydrazine hydrate and compound 4
Scheme 1. Preparation of pyrimidone derivatives.

FACILE SYNTHESIS OF PYRIMIDONE DERIVATIVES
2329
Scheme 2. Synthesis of compound 5.
strongly influenced the pathway of this reaction to give different products. When the
molar ratio of hydrazine hydrate and compound 4 is more than 2.0, the intramolecu-
lar nucleophilic addition reaction could produce compound 5 through the
reaction of ring expansion.[12] Otherwise, when it is less than 2.0, the imine
compound 14 will be obtained through the formation of intermediate as shown in
the mechanism with compound 4 (Scheme 2). Hydrogen chloride gas and 1 M hydro-
chloric acid were added to
5
to produce 4-amino-6-methyl-3-O-2-
,3,4,5-tetrahydro-1,2,4-triazine 6. The final Schiff base was produced easily when 6
was dissolved in ethanol and two to three drops of concentrated hydrochloric acid
were added. The yield reached 75.0–88.0%.
Treatment of o-toluidine 8 with triphosgen afforded 1-isocyanato-2-methyl-
benzene 9 (85.0% yield), which was halogenated with N-bromosuccinimide (NBS)
to give 5-methyl-1,3,4-oxadiazol-2(3H)-one 10 (75.0% yield). After reaction with
methanol (90.2% yield), cyclization of the resulting methyl N-[2-(bromomethyl)phe-
nyl]carbamate 11 with hydrazine hydrate gave 3-amino-benzo[b] pyrimidin-2-one 12
in 86.0% yield. For the synthesis of 12, 11 was selected as starting material obtained
from 10 instead of 4-(2-(bromomethyl)phenyl)semicarbazide 15, because 15 cannot
be cyclized to produce 12 (Scheme 3).
Because of the existence of a Schiff base in the aza-pyrimidone and
beno-pyrimidone derivatives, these compounds have two kinds of configuration.
As we all know, there are many cis-trans isomerous pesticides and the bioactivity
of these pesticides varies enormously. For example, the bio-activity of E-methomyl
=
(Lannate) is far less than that of the Z-methomyl as the C N isomerous pesti-
cide.[13] We prepared the single crystal of pymetrozine in methanol. According to
the x-ray data of pymetrozine, it is clear that pymetrozine has the trans structure.
=
The trizinone ring and pyridine form the E structure through the C N of the Schiff
bases. In additional, the atoms of trizinone ring and Schiff bases are coplanar to
obtain the lowest energy for the formation of an intramolecular hydrogen bond
˚
among O(1), N(4), and H of methanol [O(2)-H(2) ...N(4) ¼ 3.187(3) A, O(2)-H(2)
˚
...O(1) ¼ 2.821(3) A] (Fig. 1). This may imply that pymetrozine also could form

2330
B. WANG ET AL.
Scheme 3. Synthesis of compound 12.
the five-member ring with the action goals through the nonbond interaction. The
x-ray structure also showed that there are two molecular actions for the dimer
aggregation state formation of an intramolecular hydrogen bond between O(1)
˚
and N(1) [N(1)-H(1) ...O(1 W) ¼ 2.915(2) A]. Full crystallographic details were
deposited at the Cambridge Crystallographic Data Centre (CCDC 689819).
EXPERIMENTAL
All melting points were determined using a micro-melting-point apparatus
made in Beijing and are uncorrected. 1H NMR spectra were recorded with a Bruker
WP-500SY (500-MHz) spectrometer with tetramethylsilane (TMS) as the internal
standard. The chemical shifts are reported in parts per million (ppm) relative to
TMS. Infrared (IR) spectra were measured on KBr disks using a Nicolet FT-IR-
20SX instrument. High-resolution mass spectra were obtained on a Micro Mass
GCT CA 055 spectrometer. Combustion analyses for elemental composition were
made with an Italian MOD 1106 analyzer. Analytical thin-layer chromatography
(TLC) was carried out on precoated plated (silica gel 60F254), and spots were visua-
lized with ultraviolet light. All chemicals or reagents were purchased from standard
commercial suppliers.
X-Ray Data
C11H15N5O2, Mr ¼ 249.28, monoclinic, P2(1)=c, a ¼ 8.8612(12), b ¼
3
11.4273(15), c ¼ 12.6305(16) A, V ¼ 1275.8(3) A , Dx ¼ 1.205 g cmꢀ3, Z ¼ 4,
m ¼ 0.094 cmꢀ1, T ¼ 293(2) K. A colorless pymetrozine crystal, which was prepared
by slow evaporation from methanol, was used for data collection with a Rigaku
AFC7 R diffractometer. Cell constants and a full matrix were used for data collection,
obtained from a least-squares refinement. A total of 7386 reflections were collected.
No decay correction was applied. The data were corrected for Lorentz and polarization
effects. The final cycle of full-matrix least-squares refinement was based on 2787
observed reflections [I>s(I)] and 174 variable parameters and converged with
˚
˚

FACILE SYNTHESIS OF PYRIMIDONE DERIVATIVES
2331
Figure 1. X-ray crystal structure of pymetrozine in methanol.
R ¼ 0.0489 and Rw ¼ 0.0967. The program package SHELX-97 was used for structure
solution and full-matrix least-squares refinement on F2.
Oxadiazolones 3 and 4
These compounds were prepared by the corresponding literature methods.
Compound 3: Yield: 95%; mp: 112.0–114.3 ꢁC (literature value[13]: yield: 98%; mp:
110.0–111.5 ꢁC). Compound 4: Yield: 82%; mp: 86.7–88.0 ꢁC (literature value[14]
yield: 90%; mp: 85 ꢁC).
:
4-Acylamino-6-methyl-2,3,4,5-tetrahydro-3-o-1,2,4-triazin 5
Hydrazine hydrate (10 mmol) was added to a solution of compound 4
(10 mmol) in 40 mL 1-propanol. The reaction mixture was refluxed for 3 h. Then
the solvent was removed, and the resulting solid was washed by 1-propanol and fil-
tered. Then pure compound 5 was obtained. Yield: 87%; mp: 206.0–208.0 ꢁC. IR
(KBr, cmꢀ1): 3480, 3260, 3200, 1700, 1660, 1580, 1500, 1380, 1350, 1320, 1240,
1010, 700, 600; EI-MS (m=z, %): 171 (Mþ þ H, 0.38), 128 (Mþ þ H-CH3CO,
61.65), 113 (Mþ þ H-CH3CONH, 71.47), 112 (C4H6N3O, 100.00), 60 (42.62), 43
(17.06).
4-Amino-6-methyl-2,3,4,5-tetrahydro-3-o-1,2,4-triazin 6
HCl gas (0.03 mol) was bubbled in a stirred solution of compound 5 (0.02 mol)
in methanol at 45–50 ꢁC. Then the reaction mixture was stirred for 2 h at this
temperature. When the reaction completed, the reaction mixture was cooled to
10–15 ꢁC, and its pH value was modulated to 5 by 30% sodium hydrate. After the
solvent and water were removed, the resulting solid was dissolved in ethanol and

2332
B. WANG ET AL.
filtered. The solvent of the filtrate was removed to give compound 6 as a colorless
1
solid. Yield: 72%; p: 128.0–130.0 ꢁC. H NMR (CD3COCD3, 500 MHz): d 4.02 (s,
2H, CH2), 1.87 (s, 3H, CH3) ppm; IR (KBr, cmꢀ1): 3240, 3170, 3100, 2960, 1680,
1660, 1480, 1330, 1170, 1010, 890, 730; GC-MS (m=z, %): 128 (Mþ, 100.00), 113
(Mþ-CH3, 47.22), 112 (Mþ-NH2, 0.93), 98 (Mþ-NNH2, 3.70), 70 (Mþ-CONNH2,
6.48), 44 (CH2NNH2, 42.59).
6-Methyl-2,3,4,5-tetrahydro-1,2,4-triazin-3-one Derivative 7
Two or three drops of hydrochloric acid were added to a solution of compound
6 (1 mmol) in 15 mL ethanol at 50 ꢁC. After this, aldehyde (1 mmol) was added.
When the solid was found, the reaction mixture was heated to reflux. TLC (ethyl
acetate = petroleum ether ¼ 2:1, v=v). After the completion of reaction, the reaction
mixture was cooled by ice water, and the compound 7 was precipitated and
recrystallized by methanol.
6-Methyl-4-[(2-chloro-pyridin-3-yl-methylene)amino]-1,2,4-triazin-3-one
1
(7a). Yield: 88%; mp: 228.3–229.2 ꢁC; H NMR (DMSO-d6, 500 MHz): d 10.18 (s,
1H, NH), 8.66 (s, 1H, CH), 8.15 (dd, 1H, J ¼ 1.18 Hz, 1.38 Hz, CH), 7.89 (s, 1H,
CH), 7.59 (d, 1H, J ¼ 8.32 Hz, CH), 4.36 (s, 2H, CH2), 1.94 (s, 3H, CH3) ppm; IR
(KBr, cmꢀ1): 3230, 3130, 2920, 1690, 1670, 1470, 1320, 1240, 1150, 1050, 730;
GC=mass (m=z, %): 251 (Mþ, 10), 113 (C4H7N3Oþ, 61), 112 (C4H7N3Oþ, 61), 98
(C3H4N3Oþ, 100). Anal. calcd. for C10H10ClN5O: 251.0573; found: 251.0577.
6-Methyl-4-[(thiophene-3-yl-methylene)amino]-1,2,4-triazin-3-one (7b). Yield:
80%; mp 224.3–226.0 ꢁC; 1H NMR (DMSO-d6, 500 MHz): d 10.03 (s, 1H, NH), 7.92
(s, 1H, CH), 7.82 (d, 1H, J ¼ 2.70 Hz, CH), 7.60 (dd, 1H, J ¼ 2.87 Hz, 5.02 Hz, CH),
7.43 (d, 1H, J ¼ 4.68 Hz, CH), 4.30 (s, 2H, CH2), 1.92 (s, 3H, CH3) ppm; IR (KBr,
cmꢀ1): 3240, 3120, 3070, 2950, 1700, 1670, 1480, 1320, 1220, 1170; EI-MS (m=z, %):
222 (Mþ, 9.23), 113 (Mþ-C5H4NS, 49.49), 98 (C3H4N3Oþ, 100.00). Anal. calcd. for
C9H10N4OS: 222.0575. Found: 222.0576.
6-Methyl-4-[(2-chlor-thiazole-3-yl-methylene)amino]-1,2,4-triazin-3-one
1
(7c). Yield: 83%; mp: 232.2–235.0 ꢁC; H NMR (DMSO-d6, 500 MHz): d 10.18 (s,
1H, NH), 8.08 (s, 1H, CH), 7.93 (s, 1H, CH), 4.32 (s, 2H, CH2), 1.92 (s, 3H,
CH3) ppm; IR (KBr, cmꢀ1): 3264, 3140, 2920, 1700, 1680 1480, 1400, 1320, 1140,
1050; EI-MS (m=z, %): 257 (Mþ, 6.32), 118 (C3H4ClNS, 6.39), 113 (Mþ-C4H2ClN2S,
29.91). 98 (C3H4N3O, 100.00). Anal. calcd. for C8H8ClN5OS: 257.0115. Found:
257.0889.
6-Methyl-4-[(furan-3-yl-methylene)amino]-1,2,4-triazin-3-one (7d). Yield:
1
75%; mp: 239.0–239.8 ꢁC; H NMR (DMSO-d6, 500 MHz): d 9.98 (s, 1H, NH),
8.03 (s, 1H, CH), 7.83 (s, 1H, CH), 7.72 (d, 1H, J ¼ 1.55 Hz, CH), 6.73 (d, 1H,
J ¼ 1.62 Hz, CH), 4.26 (s, 2H, CH2), 1.90 (s, 3H, CH3) ppm; IR (KBr, cmꢀ1):
3240, 3120, 3070, 2950, 1700, 1670, 1480, 1330, 1230, 1140; EI-MS (m=z, %): 206
(Mþ, 7.59), 113 (Mþ-C5H4NO, 30.57), 98 (C3H4N3Oþ, 100.00). Anal. calcd. for
C9H10N4O2: 206.0804. Found: 206.0802.

FACILE SYNTHESIS OF PYRIMIDONE DERIVATIVES
2333
6-Methyl-4-[(indole-3-yl-methylene)amino]-1,2,4-triazin-3-one (7e). Yield:
85%; mp: 243.3–247.4 ꢁC; 1H NMR (DMSO-d6, 500 MHz): d 11.46 (s, 1H, NH), 9.90
(s, 1H, NH), 8.13 (s, 1H, CH), 7.73 (d, 1H, J ¼ 2.70 Hz, CH), 7.42 (d, 1H,
J ¼ 8.06 Hz, CH), 7.32 (d, 1H, J ¼ 7.76 Hz, CH), 7.17(t, 1H, J ¼ 7.51 Hz, 7.57 Hz,
CH), 7.11 (t, 1H, J ¼ 7.45 Hz, CH), 4.33 (s, 2H, CH2), 1.94 (s, 3H, CH3) ppm; IR
(KBr, cmꢀ1): 3230, 3120, 2980 2280, 1690, 1670, 1490, 1330, 1250, 1140, 840, 740,
510; EI-MS (m=z, %): 255 (Mþ, 14.31), 142 (C9H6N2 100.00), 113 (Mþ-C9H9N2
19.02), 98 (C3H4N3O, 57.42). Anal. calcd. for C13H13N5O: 255.1120. Found:
255.1091.
Compounds 9 and 10
These compounds were prepared by the corresponding literature methods.
Compound 9: yield: 85%; bp: 62.0–64.0 ꢁC (3.33 kPa) [literature value[15]: Yield:
88%; bp: 80.0 ꢁC (3.99 kPa)]. Compound 10: Yield: 75%; mp: 10.2–12.3 ꢁC (literature
value[16]: yield: 72%; mp: 8.0–12.0 ꢁC).
Methyl N-[2-(Bromomethyl)phenyl]carbamate 11
Absolute ether (10 mL) was added to the stirred compound 10 in 20 mL
methanol. When some white solid was formed, the reaction mixture was placed in
the refrigerator for 12 h. After that, the solution was filtered, and the white solid
was dried to give compound 11. Yield: 90.2%; mp: 134.0–136.5 ꢁC; GC=mass (m=
z, %): 163 (Mþ-HBr, 100), 133 (Mþ-CH4BrO, 55), 104 (Mþ-C2H4BrO2, 27).
3-Amino-benzo[b]pyrimidin-2-one 12
Hydrazine hydrate (5 mmol) was added to the solution of compound 11
(5 mmol) in 10 mL methanol in 10 min at 35–45 ꢁC. Then the reaction mixture was
stirred for 8 h at this temperature and refluxed for 5 h. After the reaction mixture
cooled, the solvent was removed, and a white solid was precipitated. The solid was
purified using column chromatography to give compound 12 as a white powder.
Yield: 86.0%; mp: 182.0–187.1 ꢁC[17]; GC=Mass (m=z, %): 163 (Mþ, 100), 132 (Mþ-
NHNH2, 87), 104 (Mþ- NHNH2-CO), 77 (C6Hþ5 , 14).
Benzo[b]pyrimidin-2-one Derivative 13
Two to three drops of hydrochloric acid were added to a solution of compound
12 (1 mmol) in 10 mL ethanol at 30 ꢁC. Then aldehyde (1 mmol) was added. When
the solid was found, the reaction mixture was stirred for 5 h at 60 ꢁC. After com-
pletion of the reaction finished [TLC (ethyl acetate=petroleum ether ¼ 3:1, v=v)],
the mixture was cooled by ice water, and compound 13 was precipitated and
recrystallized by methanol.
3-[(2-Chlor-pyridin-3-yl-methylene)amino]-benzo[b]pyrimidin-2-one
1
(13a). Yield: 85%; mp: 218.3–220.6 ꢁC; H NMR (DMSO-d6, 500 MHz): d 9.92 (s,
1H, NH), 8.69 (d, 1H, J ¼ 1.68 Hz, CH), 8.13 (m, 1H, J ¼ 1.99 Hz, 8.32 Hz, H), 8.06

2334
B. WANG ET AL.
(s, 1H, CH), 7.60 (d, 1H, J ¼ 8.32 Hz, CH), 7.20 (t, 2H, J ¼ 7.72 Hz, CH), 6.97 (t, 1H,
J ¼ 7.49 Hz, CH), 6.87 (d, 1H, J ¼ 7.89 Hz, CH), 4.93 (s, 1H, CH2) ppm; IR (KBr,
cmꢀ1): 3220, 3140, 3080, 2930, 1680, 1610, 1480, 1420, 1320, 1220, 1140, 1100,
750, 730; EI-MS (m=z, %) 286 (Mþ, 3.83), 147 (C8H7N2Oþ, 100.00), 148
(C8H8N2Oþ, 21.21), 132 (C8H6NOþ, 3.31), 104 (C2H6Nþ, 3.95), 77 (C6Hþ5 , 3.58).
Anal. calcd. for C14H11ClN4O: 286.0626. Found: 286.0628.
3-[(Thiophene-3-yl-methylene)amino]-benzo[b]pyrimidin-2-one (13b). Yield:
75%; mp: 238.2–240.0 ꢁC; 1H NMR (DMSO-d6, 500 MHz): d 9.75 (s, 1H, NH), 8.13
(s, 1H, CH), 7.84 (d, 1H, J ¼ 2.23 Hz, CH), 7.61 (dd, 1H, J ¼ 3.07 Hz, 2.85 Hz, CH),
7.49 (d, 1H, J ¼ 5.03 Hz, CH), 7.23–7.18 (m, 2H, CH), 6.96 (t, 1H, J ¼ 7.46 Hz, CH),
6.87 (d, 1H, J ¼ 7.94 Hz, CH), 4.88 (s, 2H, CH2) ppm; IR (KBr, cmꢀ1): 3400, 3200,
3080, 2920, 2890, 1680, 1610, 1480, 1430, 1320, 1220, 750; EI-MS (m=z, %) 257 (Mþ,
3.83), 147 (C8H7N2Oþ, 100.00), 148 (C8H8N2Oþ, 21.21), 132 (C8H6NOþ, 3.31), 104
(C2H6Nþ, 3.95), 77 (C6H5þ, 3.58). Anal. calcd. for C13H11N3OS: 257.0620. Found:
257.0623.
3-[(2-Chloro-thiazole-3-yl-methylene)amino]-benzo[b]pyrimidin-2-one
1
(13c). Yield: 78%; Mp: 231.6–233.0 ꢁC; H NMR (DMSO-d6, 500 MHz): d 9.93 (s,
1H, NH), 8.24 (s, 1H, CH), 7.94 (s, 1H, CH), 7.19 (t, 2H, J ¼ 7.44 Hz, 7.54 Hz, CH),
6.97 (t, 1H, J ¼ 7.40 Hz, CH), 6.85 (d, 1H, J ¼ 7.91 Hz, CH), 4.89 (s, 2H, CH2) ppm;
IR (KBr, cmꢀ1): 3230, 3100, 2980, 1700, 1610, 1480, 1410, 1320, 1220, 1050, 750,
730, 600; EI-Ms(m=z, %) 292 (Mþ, 3.23), 147 (C8H7N2Oþ, 100.00), 148 (C8H8N2Oþ,
18.20), 132 (C8H6NOþ, 8.06), 104 (C2H6Nþ, 5.83), 77 (C6H5þ, 4.73). Anal. calcd. for
C12H9ClN4OS: 292.0194. Found: 292.0192.
3-[(Furan-3-yl-methylene)amino]-benzo[b]pyrimidin-2-one (13d). Yield:
70%; mp: 234.9–236.0 ꢁC; 1H NMR (DMSO-d6, 500 MHz): d 9.80 (s, 1H, NH), 8.16
(s, 1H, CH), 8.01 (d, 1H, J ¼ 1.57 Hz, CH), 7.17 (t, 2H, J ¼ 7.53 Hz, 7.56 Hz, CH),
7.13 (d, 1H, J ¼ 2.11 Hz, CH), 7.03 (d, 1H, J ¼ 1.63 Hz, CH), 6.90 (t, 1H, J ¼ 7.43 Hz,
Hz, CH), 6.83 (d, 1H, J ¼ 7.93 Hz, CH), 4.74 (s, 2H, CH2) ppm; IR (KBr, cmꢀ1):
3400, 3200, 3080, 2920, 2890, 1680, 1610, 1480, 1400, 1320, 1210, 750; EI-MS (m=
z, %) 241 (Mþ, 5.52), 147 (C8H7N2Oþ, 100.00), 148 (C8H8N2Oþ, 18.84), 132
(C8H6NOþ, 5.01), 104 (C2H6Nþ, 4.80), 77 (C6Hþ5 , 4.55). Anal. calcd. for
C13H11N3O2: 241.0852. Found: 241.0855.
3-[(Indole-3-yl-methylene)amino]-benzo[b]pyrimidin-2-one (13e). Yield:
90%; mp: 218.0–220.3 ꢁC; 1H NMR (DMSO-d6, 500 MHz): d 9.65 (s, 1H, NH), 8.39
(s, 1H, NH), 8.38 (s, 1H, CH), 7.84 (s, 1H, CH), 7.46 (d, 1H, J ¼ 8.03 Hz, CH),
7.27–7.14 (m, 5H, Ar-H), 6.95 (t, 1H, J ¼ 7.40 Hz, CH), 6.89 (d, 1H, J ¼ 7.91 Hz,
CH), 4.91 (s, 2H, J ¼ 1.63 Hz, CH2) ppm; IR (KBr, cmꢀ1): 3240, 3080, 2980, 2920,
1700, 1500, 1320, 1480, 1220, 1750; EI-MS (m=z, %) 290 (Mþ, 7.81), 147 (C8H7N2Oþ,
, 100.00), 148 (C8H8N2Oþ, 15.59), 132 (C8H6NOþ, 3.44), 104 (C2H6Nþ, 3.30), 77
(C6Hþ5 , 3.51). Anal. calcd. for C17H14N4O: 290.1176. Found: 290.1172.
ACKNOWLEDGMENTS
This work was financial supported by National Basic Research Program
of China (973 Program, 2010CB126100), National High Technology Research,

FACILE SYNTHESIS OF PYRIMIDONE DERIVATIVES
2335
Development Program of China (863 Program, 2011AA10A207), Key Projects in
the National Science and Technology Pillar Program during the Twelfth Five-Year
Plan Period (2011BAE06B01) and National Science Foundation China Program
Grant (20872034), and Program for New Century Excellent Talents in University
(NCET070284). This work was also partly supported by Shanghai Foundation of
Science and Technology (08391911600, 0XD1401300, 073919107) and Shanghai
Leading Academic Discipline Project, Project No. B507, and 111 Project (No.
B07023).
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