Home The structure of (E)-6-(cyclopropylmethyl)-11-(2,2-difluoropropylidene)-2-methyl-6, 11-dihydrodibenzo[c,f][1,2]thiazepine 5,5-dioxide, C21H21F2NO2S
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The structure of (E)-6-(cyclopropylmethyl)-11-(2,2-difluoropropylidene)-2-methyl-6, 11-dihydrodibenzo[c,f][1,2]thiazepine 5,5-dioxide, C21H21F2NO2S

  • Ji Wang ORCID logo , Wenhui Wu , Fuhua Lin , Jie Wang and Xiuzhi Zhang EMAIL logo
Published/Copyright: April 25, 2025

Abstract

C21H21F2NO2S, monoclinic, P21/n (no. 14), a = 12.0799(4) Å, b = 12.8538(4) Å, c = 12.2063(4) Å, β = 95.769(1)°, V = 1885.70(11) Å3, Z = 4, R gt(F) = 0.0437, wRref (F 2) = 0.1261, T = 150 K.

CCDC no.: 2440438

The molecular structure is shown in the figure. Table 1 contains the 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 × 0.05 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.21 mm−1
Diffractometer, scan mode: Bruker D8 VENTURE, φ and ω scans
θ max, completeness: 26.4°, 99 %
N(hkl)measured , N(hkl)unique, R int: 16081, 3822, 0.053
Criterion for I obs, N(hkl)gt: I obs > 2σ(I obs), 3,184
N(param)refined: 246
Programs: Bruker, 1 SHELX, 2 , 3 Olex2 4

1 Source of materials

In an oven-dried 100 mL sealed tube equipped with a magnetic stir bar, N-(cyclopropylmethyl)–N-(2-ethynylphenyl)-4-methylbenzenesulfonamide (3 mmol, 1 equiv.), 2,4-difluoro-1-iodobenzene (12 mmol, 4 equiv.), di-tert-butyl sulfoxide (12 mmol, 4 equiv.), [iridium(III) complex of 2,2′-bipyridyl-4, 4′-di-tert-butyl-2,2′-bipyridine and 2-phenylpyridine] hexafluorophosphate ([Ir(dtbbpy)(ppy)2][PF6], 3 mol %), and dichloromethane (15 mL) were combined. The reaction vessel was backfilled with nitrogen to maintain an inert atmosphere. The mixture was stirred at ambient temperature and irradiated with blue light-emitting diodes (30 W) for 24 h. Upon completion, the reaction was quenched by extraction with ethyl acetate (20 mL × 3). The organic layers were washed sequentially with saturated aqueous sodium bicarbonate and brine (60 mL), then dried over anhydrous magnesium sulfate. After filtration, the solvents were removed under reduced pressure. The crude product was purified by silica gel column chromatography to yield the desired product. Subsequently, 0.1 g of the crude product was dissolved in 10 mL of ethyl acetate, and crystals of the compound described in the title were obtained as the solvent evaporated.

2 Experimental details

Single-crystal X-ray diffraction analysis was conducted using a Bruker D8 Venture diffractometer. 1 The initial structure solution was obtained using ShelXT, 2 and subsequent refinement was performed using ShelXL 3 within the Olex2 software environment. 4

3 Comment

Dioxodibenzothiazepines and dibenzazepines are key structural motifs found in a wide range of biologically active molecules, particularly in drug discovery, owing to their diverse pharmacological profiles. 5 The study of their crystal structures is essential for understanding the relationship between molecular structure and biological activity, offering the possibility to the development of new therapeutic agents. 6 , 7 , 8

The title molecule features a dibenzo[c,f] 1 , 2 thiazepine core (see the Figure), which consists of a seven-membered heterocyclic ring incorporating both sulfur and nitrogen atoms. 9 , 10 , 11 Substituents at positions 6 and 11 of the thiazepine ring include a cyclopropylmethyl group and a 2,2-difluoropropylidene group, respectively. The cyclopropylmethyl group, a strained three-membered ring, introduces potential conformational flexibility to the structure, while the 2,2-difluoropropylidene group, a difluorinated alkene, may significantly influence the electronic properties and rigidity of the molecule. The C–F bonds are relatively short, measuring around 1.38 Å, which is consistent with the strong, highly polarized nature of the C–F bond. The C–S bond shows a length of 1.77 Å, reflecting the typical bond distance in thiol-ether linkages.

As shown in the figure, the thiazepine ring is also oxidized at the sulfur atom (S1), forming a 5,5-dioxide structure, with two oxygen atoms (O1 and O2) attached to the sulfur. Functional groups such as fluorine (F1 and F2) and oxygen (O1, O2) play crucial roles in potential intermolecular interactions and packing within the crystal lattice. The presence of double bonds within the 2,2-difluoropropylidene group and the bulky cyclopropylmethyl substituents may induce distinctive electronic interactions and packing effects, which could influence the overall crystallographic properties and stability of the compound.


Corresponding author: Xiuzhi Zhang, Shanxi Vocational University of Engineering Science and Technology, Jinzhong, Shanxi, China, E-mail:

Acknowledgments

This work was financially supported by Shanxi Vocational University of Engineering Science and Technology Research fund project (KJ202414).

References

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Received: 2025-02-28
Accepted: 2025-04-02
Published Online: 2025-04-25
Published in Print: 2025-08-26

© 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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