Home Physical Sciences Crystal structure of 2-chloro-11-(((fluoromethyl)sulfonyl)methyl)-6-methyl-6,11-dihydrodibenzo[c,f][1,2]thiazepine 5,5-dioxide, C16H13ClFNO4S2
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Crystal structure of 2-chloro-11-(((fluoromethyl)sulfonyl)methyl)-6-methyl-6,11-dihydrodibenzo[c,f][1,2]thiazepine 5,5-dioxide, C16H13ClFNO4S2

  • Shaoyan Fu , Hongqian Liu , Yanrong Gao , Ji Wang ORCID logo and Wenqiang Tang ORCID logo EMAIL logo
Published/Copyright: April 24, 2025

Abstract

C16H13ClFNO4S2, monoclinic, P21/c (no. 14), a = 8.9984(2) Å, b = 18.0668(6) Å, c = 10.3178(3) Å, β = 95.5070(10)°, V = 1669.65(8) Å3, Z = 4, R gt (F) = 0.0405 wR ref (F2) = 0.1048, T = 150 K.

CCDC no.: 2442657

The molecular structure is shown in the figure. Table 1 contains crystallographic data. The list of the atoms including atomic coordinates and displacement parameters can be found in the cif-file attached to this article.

Table 1:

Data collection and handling.

Crystal: Colourless block
Size: 0.15 × 0.08 × 0.06 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.51 mm−1
Diffractometer, scan mode: Bruker D8 VENTURE, φ and ω scans
θmax, completeness: 26.4°, 100 %
N(hkl)measured, N(hkl)unique, Rint: 12889, 3393, 0.057
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 2,698
N(param)refined: 227
Programs: Bruker, 1 SHELX, 2 , 3 Olex2 4

1 Source of materials

The reaction components, including 4-bromo–N-(2-ethynylphenyl)–N-methylbenzenesulfonamide (3 mmol, 1 eq.), 2,4-difluoro-1-iodobenzene (12 mmol, 4 eq.), di-tert-butyl sulfoxide (12 mmol, 4 eq.), and [Ir(dtbbpy) (ppy)2][PF6] (3 mol%, photocatalyst), were sequentially introduced into the dried vessel. The reaction setup was sealed with a Teflon-coated septum cap and purged with nitrogen gas (3 min) to establish an inert atmosphere. The heterogeneous mixture was maintained under magnetic stirring at ambient temperature while irradiated with blue light from a 30 W LED array (λ = 350 nm) for 24 h. Upon reaction completion, the process was quenched by sequential addition of ethyl acetate (20 mL × 3). The organic phase was separated using a separatory funnel, washed successively with saturated sodium bicarbonate solution (60 mL) and brine (60 mL), and dried over anhydrous MgSO4. After gravity filtration, the solvent was removed through rotary evaporation. The crude product was purified by flash column chromatography (silica gel, 200–300 mesh, EtOAc/hexane 1:1 v/v). A portion of the isolated compound (0.1 g) was dissolved in EtOAc (10 mL) and allowed to slowly evaporate at room temperature, yielding colorless needle-like crystals of the target molecule.

2 Experimental details

Single-crystal X-ray diffraction data for the title compound were obtained through Mo Kα radiation measurements (λ = 0.7093 Å) collected at 150 K using a Bruker D8 Venture diffractometer. 1 The initial phase solution was derived using the ShelXT algorithm, 2 followed by progressive iterative modeling and constrained least-squares optimization employing ShelXL 3 within the Olex2 integrated software environment. 4

3 Comment

The dioxodibenzothiazepines and their derivatives represent a structurally intriguing and biologically significant class of heterocyclic compounds, characterized by a fused bicyclic framework incorporating two benzene rings, a thiazepine ring, and two oxygen atoms in the 5,5-position. 5 These molecules have garnered considerable attention in medicinal chemistry and organic synthesis. The absence of definitive single-crystal structures for many derivatives has limited the understanding of critical structural determinants of biological activity, such as conformational flexibility, hydrogen-bonding networks, and π-π stacking interactions. 6 , 7 , 8 , 9

The molecular structure of the title compound (depicted in the figure) features a fused bicyclic framework comprising carbon, oxygen, sulfur, nitrogen, and fluorine atoms. The core architecture consists of a 6, 11-dihydrodibenzo[c,f][1,2]thiazepine ring system fused to a thiazepine moiety . 10 , 11 , 12 , 13 A fluoromethylsulfonyl group (–SO2CH2F) at position C12, a chloro substituent at C2, and a methyl group (–CH3) at N1, all strategically positioned to modulate electronic properties and steric interactions. Aromatic carbons are connected via conjugated double bonds, while sulfur and nitrogen atoms form heterocyclic rings. The C15–F2 bonds in the fluoromethylsulfonyl moiety exhibit short lengths (1.375 Å), consistent with their high electronegativity, whereas adjacent C15–S2 single bonds display longer distances (1.796 Å). The S–O double bonds (S2–O3 and S2–O4) align with typical values (1.4385 and 1.4380 Å) for thiazepine derivatives.

Steric and electronic effects are further governed by the dihedral angles, which influence planarity and conformational flexibility. The chloro substituent at C2 and fluorinated groups contribute to significant steric hindrance. These structural features collectively determine the molecule’s physicochemical properties, including solubility and reactivity.


Corresponding author: Wenqiang Tang, Xianyang Key Laboratory of Molecular Imaging and Drug Synthesis, School of Pharmacy, Polytechnic College, Shaanxi Institute of International Trade & Commerce, Xianyang, Shaanxi, China, E-mail:

Acknowledgments

This work was financially supported by the projects of Social Development in Shaanxi Province Science and Technology Department (2023–YBSF-036), the 2024 Key Scientific Research Program Projects of the Shaanxi Provincial Department of Education (Key Laboratory Projects, 24JS004), the 2023 research and development project of the Xianyang Science and Technology Bureau (L2023–ZDYF–SF-030), Key Laboratory of Molecular Imaging and Drug Synthesis of Xianyang city (2021QXNL–PT-0008), School-level Scientific and Technological Innovation Team for Design, Synthesis and Structural Modification of Drug Molecules (2024KCTD04).

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Received: 2025-03-10
Accepted: 2025-04-10
Published Online: 2025-04-24
Published in Print: 2025-06-26

© 2025 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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