Home Physical Sciences Crystal structure of 2-amino-4-(3-bromo-4-fluoro-phenyl)-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile, C18H16BrFN2O2
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Crystal structure of 2-amino-4-(3-bromo-4-fluoro-phenyl)-7,7-dimethyl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile, C18H16BrFN2O2

  • Jing Song EMAIL logo
Published/Copyright: August 3, 2017

Abstract

C18H16BrFN2O2, monoclinic, C2/c (no. 15), a = 23.5259(15) Å, b = 9.3637(6) Å, c = 15.7104(13) Å, β = 93.786(6)°, V = 3453.3(4) Å3, Z = 8, Rgt(F) = 0.0486, wRref(F2) = 0.1366, T = 296 K.

CCDC no.:: 1429765

The crystal structure is shown in the figure. Table 1 contains details on crystal structure and measurement conditions. Table 2 lists the atoms with their coordinates and displacement parameters.

Table 1

Data collection and handling.

Crystal:Colourless prism
Size:0.18 × 0.16 × 0.14 mm
Wavelength:Mo Kα radiation (0.71073 Å)
μ:24.0 cm−1
Diffractometer, scan mode:Bruker APEXII, φ and ω
2θmax, completeness:46.2°, >99%
N(hkl)measured, N(hkl)unique, Rint:6434, 3029, 0.035
Criterion for Iobs, N(hkl)gt:Iobs > 2 σ(Iobs), 1903
N(param)refined:218
Programs:Bruker [1], SHELX [2]
Table 2

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).

AtomxyzUiso*/Ueq
Br10.21175(2)0.70247(7)0.11977(4)0.1004(4)
F10.25649(13)0.5221(3)0.26595(19)0.1064(12)
C10.43634(14)0.8184(3)−0.0118(2)0.0333(8)
C20.45189(14)0.7788(3)0.0695(2)0.0313(8)
C30.43144(14)0.8577(3)0.1455(2)0.0347(8)
H3A0.46300.86200.18930.042*
C40.41708(14)1.0075(3)0.1181(2)0.0324(8)
C50.40462(15)1.0416(3)0.0368(2)0.0345(8)
C60.48302(15)0.6516(4)0.0837(2)0.0338(8)
C70.41650(15)1.1199(4)0.1823(2)0.0403(9)
C80.40311(19)1.2688(4)0.1522(3)0.0515(11)
H8A0.43821.31540.13870.062*
H8B0.38741.32190.19820.062*
C90.36140(16)1.2748(3)0.0745(2)0.0413(9)
C100.38451(17)1.1823(3)0.0047(2)0.0429(9)
H10A0.35481.1682−0.04040.051*
H10B0.41581.2318−0.01970.051*
C110.38248(16)0.7782(4)0.1826(2)0.0375(9)
C120.3930(2)0.6884(4)0.2512(2)0.0592(12)
H12A0.42930.68500.27830.071*
C130.3505(3)0.6032(5)0.2805(3)0.0744(15)
H13A0.35790.54240.32660.089*
C140.2981(2)0.6100(4)0.2409(3)0.0655(14)
C150.28532(18)0.6995(4)0.1726(3)0.0547(11)
C160.32817(16)0.7836(3)0.1439(2)0.0411(9)
H16A0.32040.84460.09800.049*
O10.40883(11)0.9452(2)−0.02864(14)0.0418(6)
O20.42833(12)1.0922(3)0.25764(17)0.0592(8)
N10.44415(14)0.7502(3)−0.08436(18)0.0469(8)
H1A0.46130.6690−0.08340.056*
H1B0.43210.7873−0.13230.056*
N20.50901(14)0.5502(3)0.0977(2)0.0509(9)
C170.30378(18)1.2199(5)0.0988(3)0.0694(13)
H17A0.30801.12480.12110.104*
H17B0.27761.21900.04920.104*
H17C0.28941.28120.14130.104*
C180.3547(2)1.4273(4)0.0407(3)0.0632(13)
H18A0.33941.48670.08350.095*
H18B0.32921.4277−0.00960.095*
H18C0.39111.46350.02710.095*

Source of materials

The title compound was synthesized according to a reported procedure [3]. A mixture of 3,5-cyclohexanedione (10 mmol), 3-bromo-4-fluoro-benzaldehyde (10 mmol), malononitrile (10 mmol) and 4-(dimethylamino)pyridine (DMAP) (1 mmol) were refluxed in ethanol (100 mL) for 2–3 h and then cooled to room temperature. After filtering the precipitate, it was washed with ice-cooled water and ethanol sequentially and then dried under a vacuum.

Experimental details

Hydrogen atoms bonded to C and N were positioned geometrically and refined using a riding model, with C⋯H = 0.97 Å and N⋯H = 0.86 Å. Uiso(H) was set to 1.2 times Ueq(C) and Ueq(N).

Comment

The importance of the pyranyl moiety has been well proven as illustrated by a large number of patents for its use as chemotherapeutic agent [4, 5] . A number of biological activities have been associated with it, such as antihypertensive, antiasthemic, analgesic, cardiovascular, platelate aggregation inhibitor and calcium antagonist [6]. With this in mind, some new pyran derivatives have been synthesized in search of better therapeutic agents, by a convenient single pot method [7].

In the crystal structure of the title compound, the pyran ring is folded slightly (dihedral angle C4—C3—C2—C1 = 25°). The plane of the 3-bromo-4-fluoro-phenyl moiety is almost perpendicular to it. The adjacent dimethyl-cyclo-hexen-1-onyl ring adopts a “chair” conformation with an dihedral angle C4—C7—C8—C9 of 33°. Bond lengths and angles are almost in the expected ranges.

References

Bruker AXS Inc., APEX2, SAINT, SHELXTL, Madison, Wisconsin, USA, (2001).Search in Google Scholar

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Khan, A. T.; Lal, M.; Ali, S.; Khan, M. M.: One-pot three-component reaction for the synthesis of pyran annulated heterocyclic compounds using DMAP as a catalyst. Tetrahedron Lett. 52 (2011) 5327–5332.10.1016/j.tetlet.2011.08.019Search in Google Scholar

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Received: 2017-3-8
Accepted: 2017-7-18
Published Online: 2017-8-3
Published in Print: 2017-9-26

©2017 Jing Song, published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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