Synlett 2005(18): 2771-2775  
DOI: 10.1055/s-2005-918937
LETTER
© Georg Thieme Verlag Stuttgart · New York

Multiple Stille Cross-Coupling Reactions with Tribenzotriquinacenes and Fenestrindanes - En Route to Extended Convex/Concave and Saddle-Shaped Carbon Frameworks

Ling Zhoua, Xiao-Ping Cao*a, Beate Neumannb, Hans-Georg Stammlerb, Dietmar Kuck*b
a State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, P. R. of China
Fax: +86(931)8912582; e-Mail: wangql@lzu.edu.cn;
b Fakultät für Chemie, Universität Bielefeld, Universitätsstrasse 25, 33615 Bielefeld, Germany
Fax: +49(521)1066417; e-Mail: dietmar.kuck@uni-bielefeld.de;
Further Information

Publication History

Received 1 August 2005
Publication Date:
12 October 2005 (online)

Abstract

Hexabromotribenzotriquinacenes and octabromotetrabenzo[5.5.5.5]fenestranes undergo highly efficient multiple Stille cross-coupling reactions, yielding building blocks for extended convex/concave and saddle-shaped molecular scaffolds, respectively.

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The crystallographic data for 3 have been deposited at CCDC under the registry number 271522. They can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html [or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB2 1EZ, UK; fax: +44(1223)336033; e-mail: deposit@ccdc.cam.ac.uk]. The unit cell parameters and the X-ray diffraction intensities were recorded on a Nonius Kappa CCD area detector. The structure was solved by the direct method (SHELXS). Empirical formula: C26H18Br6 + 2 C4H8O. Formula weight: 954.07. T = 100 (2) K. Wavelength: 0.71073 Å. Crystal system: monoclinic, P21/c. Unit cell dimensions: a = 13.1750 (17) Å, b = 7.4460 (8) Å, c = 34.504 (4) Å, β = 96.721 (11)°; V = 3361.6 (7) Å3; Z = 4, ρcaldc = 1.885 g/cm3. Absorption coefficient: 7.196 mm-1, F(000): 1856. Crystal size: 0.30 ¥ 0.11 ¥ 0.05 mm3. Theta range for data collection: 3.11-27.50°. Index ranges: -17 ≤ h ≤ 17, -9 ≤ k ≤ 9, -43 ≤ l ≤ 44. Reflections collected/unique: 45553/7718 [R(int) = 0.0589]. Completeness to Θ = 27.50, 99.9%. Absorption correction multi-scan: Max. and min. transmission 1.000000 and 0.475662. Refinement method: Full-matrix least-squares on F2. Data/restraints/parameters: 7718/0/383. Goodness-of-fit on F2: 1.048. Final R indices [I>2σ(I)] R1 = 0.0340, wR2 = 0.0623 [6043]. R indices (all data) R1 = 0.0546, wR2 = 0.0678. Largest diff. peak and hole: 1.049 and -0.656 e Å-3. Remark: largest diff. peak near Br(6) (1.27 Å).

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Cyranski, M.; Kuck, D. unpublished results.

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Compound 6: 1H NMR (300 MHz, CDCl3): δ = 1.32 (s, 3 H), 1.62 (s, 9 H), 3.31 (d, J = 6.3 Hz, 12 H, CH2), 5.01 (dd, J = 18.6, 1.5 Hz, 6 H, =CH2), 5.03 (dd, J = 9.6, 1.5 Hz, 6 H, =CH2), 5.84-5.89 (m, 6 H, CH=), 7.10 (s, 6 H, ArH). 13C NMR (75 MHz, CDCl3): δ = 16.07 (p), 25.81 (p), 37.16 (s), 62.24 (q), 70.33 (q), 115.74 (s), 123.48 (t), 137.18 (q), 137.18 (t), 147.14 (q). HRMS (ESI): m/z calcd for C44H52N [M + NH4]+: 594.4094; found: 594.4092.

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General Experimental Procedure.
An oven-dried flask equipped with a magnetic stirring bar was charged under argon with the aryl bromide (0.05 mmol) in THF (20 mL, 40 mL for compound 4). Then, Pd(PPh3)4 (6 mg, 0.005 mmol) and CsF (0.72 mmol for 3, 0.96 mmol for 4) were added, and then the organotin reagent (0.36 mmol for 3, 0.48 mmol for 4) was added via a syringe. The flask was evacuated and refilled with argon five times. The mixture was stirred at 45 °C for about 10 h (16 h for the preparation of compound 7) and quenched with H2O. After vigorous shaking, the mixture was filtered and the aqueous layer was extracted with EtOAc. The combined organic layers were washed with brine, dried over Na2SO4, concentrated, and purified by column chromatography.

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Compound 7: 1H NMR (300 MHz, CDCl3): δ = 1.27 (s, 3 H), 1.60 (s, 9 H), 5.16 (dd, J = 11.4, 1.8 Hz, 6 H, =CH2), 5.41 (dd, J = 17.0, 1.8 Hz, 6 H, =CH2), 6.81 (dd, J = 17.0, 11.4 Hz, 6 H, CH=), 7.23 (s, 6 H, ArH). 13C NMR (75 MHz, CDCl3): δ = 16.08 (p), 25.79 (p), 62.41 (q), 70.90 (q), 115.87 (s), 120.65 (t), 135.33 (t), 136.27 (q), 148.61 (q). HRMS (ESI): m/z calcd for C38H37 [M + H]+: 493.2890; found: 493.2899.

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Compound 8: 1H NMR (400 MHz, CDCl3): δ = 1.39 (s, 3 H), 1.74 (s, 9 H), 5.90 (d, J = 3.2 Hz, 6 H), 6.38-6.40 (m, 6 H), 7.43 (dd, J = 3.2, 0.8 Hz, 6 H), 7.63 (s, 6 H, ArH). 13C NMR (100 MHz, CDCl3): δ = 16.05 (p), 25.74 (p), 62.61 (q), 70.99 (q), 107.97 (t), 111.30 (t), 123.56 (t), 129.30 (q), 141.58 (t), 148.53 (q), 153.06 (q). HRMS (ESI): m/z calcd for C50H40O6N [M + NH4]+: 750.2850; found: 750.2840.

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Compound 9: 1H NMR (400 MHz, CDCl3): δ = 1.46 (s, 3 H), 1.78 (s, 9 H), 6.79 (dd, J = 3.6, 1.2 Hz, 6 H), 6.92 (dd, J = 4.8, 3.6 Hz, 6 H), 7.22 (dd, J = 4.8, 0.8 Hz, 6 H), 7.50 (s, 6 H, ArH). 13C NMR (100 MHz, CDCl3): δ = 16.17 (p), 25.75 (p), 62.62 (q), 71.07 (q), 125.56 (t), 125.77 (t), 126.78 (t), 127.02 (t), 134.07 (q), 142.83 (q), 148.40 (q). HRMS (DEI): m/z calcd for C50H36S6 [M+]: 828.1141; found: 828.1133.

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Compound 10: 1H NMR (300 MHz, CDCl3): δ = 1.23 (s, 12 H), 3.36 (d, J = 6.0 Hz, 8 H, CH2), 3.46 (d, J = 5.7 Hz, 8 H, CH2), 4.98 (d, J = 17.1 Hz, 8 H, =CH2), 5.06 (d, J = 10.8 Hz, 8 H, =CH2), 5.90-6.07 (m, 8 H, CH=), 6.95 (s, 4 H, ArH), 7.22 (s, 4 H, ArH). 13C NMR (75 MHz, CDCl3): δ = 28.48 (p), 37.19 (s), 37.34 (s), 58.61 (q), 89.21 (q), 115.51 (s), 122.53 (t), 124.65 (t), 136.50 (q), 136.94 (q), 137.43 (t), 137.60 (t), 145.29 (q), 150.20 (q). HRMS (ESI): m/z calcd for C57H64N [M + NH4]+: 762.5033; found: 762.5022.

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Compound 12: 1H NMR (400 MHz, CDCl3): δ = 1.47 (s, 12 H), 6.00 (d, J = 3.6 Hz, 4 H), 6.08 (d, J = 3.2 Hz, 4 H), 6.42-6.45 (m, 8 H), 7.45 (d, J = 1.2 Hz, 4 H), 7.47 (s, 4 H), 7.48-7.49 (m, 4 H), 7.82 (s, 4 H). 13C NMR (100 MHz, CDCl3): δ = 28.17 (p), 58.96 (q), 89.19 (q), 108.19 (t), 111.38 (t), 111.53 (t), 122.63 (t), 124.09 (t), 129.03 (q), 141.68 (q), 141.68 (t), 146.45 (q), 151.28 (q), 153.10 (q). HRMS (ESI): m/z calcd for C65H45O8 [M + H]+: 953.3109; found: 953.3116.

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Compound 13: 1H NMR (400 MHz, CDCl3): δ = 1.52 (s, 12 H), 6.92 (dd, J = 3.6, 1.2 Hz, 4 H), 6.94-6.97 (m, 12 H), 7.26 (dd, J = 6.4, 1.2 Hz, 8 H), 7.37 (s, 4 H), 7.63 (s, 4 H). 13C NMR (100 MHz, CDCl3): δ = 28.58 (p), 59.01 (q), 89.38 (q), 124.32 (t), 125.90 (t), 126.22 (t), 126.86 (t), 127.20 (t), 133.47 (q), 133.69 (q), 142.94 (q), 143.07 (q), 146.28 (q), 151.17 (q). Various attempts to characterize 13 by mass spectrometry, including DEI, APCI and MALDI as ionization techniques, were unsuccessful.