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Regiospecific substitution of the β-vinylic sp2 carbon of cyclohexenones bearing the α-chloro- and β-tosylate-groups: Single crystal XRD/Hirshfeld surface/in-silico studies of three representative compounds
Arkalgud Satyanarayana Jeevan Chakravart (1,*)
, Suresh Hari Prasad (2) (1) Department of Studies in Chemistry, Jnana Bharathi Campus, Bangalore University, Bengaluru, 560056, India
(2) Department of Studies in Chemistry, Central College Campus, Bengaluru City University, Bengaluru, 560001, Karnataka, India
(*) Corresponding Author
Received: 11 Aug 2020 | Revised: 14 Sep 2020 | Accepted: 15 Sep 2020 | Published: 31 Dec 2020 | Issue Date: December 2020
Abstract
2-Chloro-3-tosyl-5,5-dimethyl-2-cyclohexenone was subjected to a series of regiospecific Suzuki-Miyaura cross-coupling reactions in suspensions of nine different substituted boronic acids, Pd(OAc)2, P(Ph3)3, K3PO4 and 1,4-dioxane solvent, under sealed tube conditions. The regiospecific substitution of the tosyl-group by the aryl group in preference over the chloride- group was observed. A comparison between the bromo- and tosylate group’s reactivities is highlighted. Using the methodology, the products: 2-chloro-3-aryl-5,5-dimethyl-2-cyclohexenones were isolated in greater than 85% yields. Good quality crystals of three representative compounds were obtained by slow evaporation technique and subjected to single crystal XRD studies, Hirshfeld surface analysis, 3-D energy framework, and molecular docking studies. Crystal data for compound 3; C15H17ClO4S: monoclinic, space group P21/c (no. 14), a = 8.8687(3) Å, b = 10.5537(4) Å, c = 16.6862(7) Å, β = 89.807(3)°, V = 1561.78(10) Å3, Z = 4, T = 290 K, μ(MoKα) = 0.390 mm-1, Dcalc = 1.398 g/cm3, 13623 reflections measured (6.716° ≤ 2Θ ≤ 54.962°), 3570 unique (Rint = 0.0467, Rsigma = 0.0512) which were used in all calculations. The final R1 was 0.0452 (I > 2σ(I)) and wR2 was 0.1019 (all data). Crystal data for compound 5e; C20H18O2FCl: monoclinic, space group P21/c (no. 14), a = 6.4900(5) Å, b = 18.6070(13) Å, c = 14.2146(11) Å, β = 102.324(2)°, V = 1677.0(2) Å3, Z = 4, T = 296(2) K, μ(MoKα) = 0.239 mm-1, Dcalc = 1.309 g/cm3, 25575 reflections measured (6.262° ≤ 2Θ ≤ 52.224°), 3283 unique (Rint = 0.0494, Rsigma = 0.0307) which were used in all calculations. The final R1 was 0.0875 (I > 2σ(I)) and wR2 was 0.2056 (all data). Crystal data for compound 5h; C12H13OSCl: triclinic, space group P-1 (no. 2), a = 6.7517(6) Å, b = 8.8376(9) Å, c = 12.6049(12) Å, α = 109.538(3)°, β = 98.597(3)°, γ = 90.417(3)°, V = 699.52(12) Å3, Z = 2, T = 290 K, μ(MoKα) = 0.410 mm-1, Dcalc = 1.376 g/cm3, 28754 reflections measured (6.114° ≤ 2Θ ≤ 59.288°), 3898 unique (Rint = 0.0544, Rsigma = 0.0349) which were used in all calculations. The final R1 was 0.1101 (I > 2σ(I)) and wR2 was 0.2481 (all data).
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DOI: 10.5155/eurjchem.11.4.261-275.2020
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The Council of Scientific and Industrial Research (CSIR), SRF – File no. 09/039(0119)/2018-EMR-1, Government of India, New Delhi, INDIA.
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DOI Link: https://doi.org/10.5155/eurjchem.11.4.261-275.2020
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European Journal of Chemistry 2020, 11(4), 261-275 | doi: https://doi.org/10.5155/eurjchem.11.4.261-275.2020 | Get rights and content
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