Home The crystal structure of (2R,6′R)-2′,7-dichloro-4,6-dimethoxy-6′-methyl-3H-spiro[benzofuran-2,1′-cyclohexan]-2′-ene-3,4′-dione, C16H14Cl2O5
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The crystal structure of (2R,6′R)-2′,7-dichloro-4,6-dimethoxy-6′-methyl-3H-spiro[benzofuran-2,1′-cyclohexan]-2′-ene-3,4′-dione, C16H14Cl2O5

  • Meng Zhang and Yu-Bin Bai ORCID logo EMAIL logo
Published/Copyright: January 19, 2023

Abstract

C16H14Cl2O5, orthorhombic, P212121 (no. 19), a = 23.2297(5) Å, b = 16.3509(3) Å, c = 8.7300(2) Å, V = 3315.89(12) Å3, Z = 8, Rgt(F) = 0.0472, wRref(F2) = 0.1268, T = 293 K.

CCDC no.: 2211419

The molecular structure is shown in the figure. Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal: Colourless block
Size: 0.18 × 0.14 × 0.12 mm
Wavelength: Cu Kα radiation (1.54184 Å)
μ: 3.73 mm−1
Diffractometer, scan mode: Xcalibur, ω
θmax, completeness: 71.7°, >99%
N(hkl)measured, N(hkl)unique, Rint: 13,604, 6350, 0.037
Criterion for Iobs, N(hkl)gt: Iobs > 2σ(Iobs), 5967
N(param)refined: 421
Programs: Olex2 [1], SHELX [2, 3]
Table 2:

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

Atom x y z Uiso*/Ueq
C1 0.40390(16) −0.0359(2) 0.3024(5) 0.0383(8)
C2 0.46077(15) −0.0267(2) 0.2525(5) 0.0346(7)
C3 0.48246(15) 0.0506(2) 0.2135(4) 0.0343(7)
H3 0.520322 0.055705 0.180311 0.041*
C4 0.44787(15) 0.1192(2) 0.2242(4) 0.0322(7)
C5 0.39040(15) 0.1105(2) 0.2717(4) 0.0321(7)
C6 0.37012(15) 0.0327(2) 0.3097(5) 0.0363(8)
C7 0.54806(17) −0.0951(3) 0.1820(6) 0.0509(11)
H7A 0.546491 −0.077225 0.077337 0.076*
H7B 0.564181 −0.149142 0.186367 0.076*
H7C 0.571688 −0.058282 0.240103 0.076*
C8 0.52393(18) 0.2093(2) 0.1544(7) 0.0574(13)
H8A 0.535481 0.174017 0.071973 0.086*
H8B 0.546724 0.197601 0.243439 0.086*
H8C 0.529489 0.265261 0.124763 0.086*
C9 0.34326(15) 0.1668(2) 0.2905(5) 0.0328(7)
C10 0.29049(15) 0.1126(2) 0.3358(5) 0.0372(8)
C11 0.26557(17) 0.1391(3) 0.4848(6) 0.0451(9)
C12 0.2162(2) 0.1780(3) 0.5020(7) 0.0550(11)
H12 0.204246 0.193094 0.599749 0.066*
C13 0.17962(19) 0.1981(3) 0.3694(8) 0.0569(13)
C14 0.20421(19) 0.1822(3) 0.2165(7) 0.0547(12)
H14A 0.225309 0.230263 0.183583 0.066*
H14B 0.172932 0.173711 0.144611 0.066*
C15 0.24466(16) 0.1079(2) 0.2097(6) 0.0446(10)
H15 0.221220 0.059311 0.230385 0.054*
C16 0.2709(2) 0.0969(4) 0.0513(6) 0.0616(13)
H16A 0.293218 0.144340 0.025514 0.092*
H16B 0.240778 0.089761 −0.022717 0.092*
H16C 0.295357 0.049500 0.051236 0.092*
C17 0.66929(16) 0.0863(2) 0.4327(4) 0.0351(7)
C18 0.72523(16) 0.1037(2) 0.4822(4) 0.0355(7)
C19 0.73864(15) 0.1058(2) 0.6388(5) 0.0363(8)
H19 0.776000 0.117820 0.669699 0.044*
C20 0.69723(15) 0.0901(2) 0.7469(4) 0.0338(7)
C21 0.64078(15) 0.0717(2) 0.6988(4) 0.0336(7)
C22 0.62859(16) 0.0698(2) 0.5414(4) 0.0332(7)
C23 0.82307(18) 0.1290(4) 0.4123(6) 0.0584(12)
H23A 0.845972 0.133296 0.321175 0.088*
H23B 0.835864 0.082962 0.471627 0.088*
H23C 0.827038 0.178016 0.471817 0.088*
C24 0.76241(17) 0.1103(3) 0.9552(5) 0.0438(9)
H24A 0.773212 0.164242 0.922567 0.066*
H24B 0.789254 0.071202 0.914964 0.066*
H24C 0.762710 0.107868 1.065104 0.066*
C25 0.58832(16) 0.0531(2) 0.7792(4) 0.0349(8)
C26 0.54234(15) 0.0390(2) 0.6512(4) 0.0361(7)
C27 0.51962(17) −0.0476(2) 0.6617(5) 0.0440(9)
C28 0.4701(2) −0.0679(3) 0.7276(7) 0.0586(12)
H28 0.459790 −0.122781 0.732555 0.070*
C29 0.43118(19) −0.0062(3) 0.7929(7) 0.0581(12)
C30 0.45238(17) 0.0802(3) 0.7912(5) 0.0472(9)
H30A 0.473358 0.090667 0.885295 0.057*
H30B 0.419546 0.116810 0.788791 0.057*
C31 0.49141(15) 0.0992(2) 0.6553(5) 0.0403(8)
H31 0.468818 0.090511 0.561876 0.048*
C32 0.5103(2) 0.1886(3) 0.6564(7) 0.0568(11)
H32A 0.529294 0.200624 0.751493 0.085*
H32B 0.477227 0.223261 0.645408 0.085*
H32C 0.536412 0.198228 0.572978 0.085*
Cl1 0.37635(4) −0.13056(6) 0.34976(17) 0.0577(3)
Cl2 0.30846(7) 0.11896(12) 0.64266(17) 0.0796(4)
Cl3 0.65267(4) 0.08270(7) 0.23957(10) 0.0477(3)
Cl4 0.56517(6) −0.12275(7) 0.59112(17) 0.0619(3)
O1 0.49127(11) −0.09623(16) 0.2447(4) 0.0467(7)
O2 0.46417(12) 0.19569(15) 0.1887(4) 0.0477(8)
O3 0.31403(11) 0.03064(15) 0.3511(4) 0.0455(7)
O4 0.34021(12) 0.24051(15) 0.2743(4) 0.0433(7)
O5 0.13290(16) 0.2295(3) 0.3889(7) 0.0880(16)
O6 0.76356(12) 0.1178(2) 0.3710(3) 0.0490(7)
O7 0.70581(12) 0.0919(2) 0.9002(3) 0.0440(7)
O8 0.57301(11) 0.05116(18) 0.5083(3) 0.0392(6)
O9 0.57786(12) 0.0478(2) 0.9153(3) 0.0475(7)
O10 0.38514(17) −0.0251(3) 0.8469(7) 0.0958(17)

Source of materials

2′-Hydroxy-griseofulvin (339 mg, 1.0 mmol) was mixed with LiCl (212 mg, 5 mmol) and added to a solution of phosphorylchloride (0.56 mL, 5 mmol) in dioxane (28 mL). The mixture was refluxed for 30 min, cooled to room temperature and sat. aq. sodium carbonate was added carefully to the solution until it is slightly basic (pH 7–8). The aqueous phase was extracted with DCM (3 × 20 mL) and the combined organic phases were dried (sodium sulfate anhydrous) and concentrated. The residue was purified by column chromatography DCM and the white solid (121 mg) was obtained, yield 34%. This white solid is recrystallized to obtain colorless crystals from solution (DCM: methanol 5:1) by natural cooling method at room temperature.

Experimental details

Using Olex2 [1], the structure was solved with the SHELXT [2] structure solution program and refined with the SHELXL [3] refinement package. All hydrogen atomic positions were taken from a difference Fourier map. Their Uiso values were set to 1.2Ueq (C, phenyl ring and methylene), 1.5Ueq(C, methyl) of the parent atoms, respectively. All the H atoms were refined as riding on their parent atom.

Comment

Griseofulvin is a very important natural product [4]. Several hundreds of griseofulvin analogues have been synthesized and used for drug screening since it was isolated [56]. In this paper, one analogue of griseofulvin (2R,6′R)-2′,7-dichloro-4,6-dimethoxy-6′-methyl-3H-spiro[benzo-furan-2,1′- cyclohexan]-2′-ene-3,4′-dione was synthesized by using 2′-hydroxy-griseofulvin as starting material, and the structure was determined by X-ray single crystal diffraction. It is a key chemical intermediate which was used for preparation of the 2′-modified griseofulvin analogues [7, 8].

The asymmetric unit of the title structure contains two crystallographically independent molecules, and one of these molecules is shown in the figure. In the molecule, the bond length of Cl1–C1 is 1.725(4) Å, The angle of O11–C10–C15 is 111.8(3)°, the bond lengths and angles of the title compound are similar to the structure of natural product griseofulvin [9] and a related structure [10]. The plane (C5/C6/C1) of benzene ring and the plane (C6/C5/C9) of furan ring are approximately in the same plane and their dihedral angle is only 0.87°. The plane (C10/O3/C9) of furan ring and the plane (C10/C11/C15) of cyclohexanone present a dihedral angle of about 88.13°. Cyclohexanone ring (C10/C11/C12/C13/C14/C15) has a half-chair conformation. The crystal packing exhibits weak intermolecular C–H⋯O interactions and C–H⋯Cl hydrogen bonds.


Corresponding author: Yu-Bin Bai, College of Chemistry and Chemical Engineering, Yan’an University, Yan’an, Shaanxi 716000, People’s Republic of China, E-mail:

Funding source: Natural Science Foundation of China

Award Identifier / Grant number: 22107091

Funding source: Natural Science Basic Research Program of Shaanxi

Award Identifier / Grant number: 2021JQ-609

Funding source: Doctoral Scientific Research Start-Up Fund of Yan’an University

Award Identifier / Grant number: YDBK2019-03

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: Natural Science Foundation of China (Program No. 22107091), Natural Science Basic Research Program of Shaanxi (Program No. 2021JQ-609), and Doctoral Scientific Research Start-Up Fund of Yan’an University (Program No. YDBK2019-03).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

References

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Received: 2022-11-21
Accepted: 2023-01-10
Published Online: 2023-01-19
Published in Print: 2023-04-25

© 2022 the author(s), published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

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  62. Crystal structure of bis(6-carboxyhexyl)-4,4′-bipyridinium dibromide – 2,6-dihydroxynaphthalene (1/2), C42H46Br2N2O8
  63. Crystal structure of methyl 2-(2-chloroacetyl)-1-(4-(methoxycarbonyl)phenyl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b] indole-3-carboxylate, C23H21ClN2O5
  64. Crystal structure of bis(dimethylammonium) poly[{μ4-1,1ʹ-(1,4-phenylenebis(methylene))bis(1H-pyrazole-3,5-dicarboxylato)-κ6N4O2}zinc(II)], C22H26N6O8Zn
  65. Crystal structure of 2-(2-(4-methoxyphenyl)-2H-indazol-3-yl)acetonitrile, C16H13N3O
  66. Crystal structure of (E)-7-methoxy-2-(4-morpholinobenzylidene)-3,4-dihydronaphthalen-1(2H)-one, C22H23NO3
  67. The crystal structure of N′1,N′2-bis((E)-3-(tert-butyl)-2-hydroxybenzylidene)oxalohydrazide, C24H30N4O4
  68. The crystal structure of trimethyl 2,2′,2′′-(benzene-1,3,5-triyltris(oxy))triacetate, C15H18O9
  69. Crystal structure of bis(N,N-dimethylformamide-κO)-bis(pyridine-2-carboxylato-κ2N,O)-bis(μ2-pyridine-2-carboxylato-κ2N,O)-dinickel(II), C30H30N6Ni2O10
  70. Crystal structure of bis(μ2-1-pyrenecarboxylato-κ3O,O′:O′)-bis(1-pyrenecarboxylato-κ2O,O′)-(benzimidazole-κ1N)dicadmium(II), C82H48Cd2N4O8
  71. One-pot synthesis and crystal structure of diethyl 2,6-dimethyl-4-(1-(2-nitrophenyl)-1H-1,2,3-triazol-4-yl)-1,4-dihydropyridine-3,5-dicarboxylate, C21H23N5O6
  72. The crystal structure of 1-(2-fluorobenzoyl)-5-methoxy-2-methyl-1H-indole-3-carbonitrile, C18H13FN2O2
  73. Crystal structure of bis(trimethylphenylammonium) aqua-oxido-octathiotritungstate, (Me3PhN)2[W3OS8(H2O)]
  74. The crystal structure of trichlorido[N-[(2-oxyphenyl)methylidene]phenylglycinemethylester-κ3O,N,O′]-tin(IV) – methylene chloride (1/1), C16H14Cl3NO3Sn·CH2Cl2
  75. The crystal structure of furan-2,5-diylbis((4-chlorophenyl)methanol), C18H14Cl2O3
  76. The crystal structure of hexalithium decavanadate hexadecahydrate, H32Li6O44V10
  77. Crystal structure of ethyl 4-{[5-(adamantan-1-yl)-2-sulfanylidene-2,3-dihydro-1,3,4-oxadiazol-3-yl]methyl}piperazine-1-carboxylate, C20H30N4O3S
  78. Crystal structure of aqua(μ2-2,2′,2″-((nitrilo)tris(ethane-2,1-diyl(nitrilo)methylylidene))tris (6-ethoxyphenolato))(pentane-2,4-dionato-κ2O,O′)-dinickel(II), C38H48N4Ni2O9
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