Synlett 2016; 27(13): 1997-2002
DOI: 10.1055/s-0035-1561862
letter
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Unsymmetrically Disubstituted Tetraphenylenes via Carbonyl-Directed C–H Functionalization

Shulei Pan
Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, 200092, P. R. of China   Email: zhangyanghui@tongji.edu.cn
,
Hang Jiang
Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, 200092, P. R. of China   Email: zhangyanghui@tongji.edu.cn
,
Yu Zhang
Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, 200092, P. R. of China   Email: zhangyanghui@tongji.edu.cn
,
Dushen Chen
Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, 200092, P. R. of China   Email: zhangyanghui@tongji.edu.cn
,
Yanghui Zhang*
Department of Chemistry, and Shanghai Key Lab of Chemical Assessment and Sustainability, Tongji University, 1239 Siping Road, Shanghai, 200092, P. R. of China   Email: zhangyanghui@tongji.edu.cn
› Author Affiliations
Further Information

Publication History

Received: 30 March 2016

Accepted after revision: 18 April 2016

Publication Date:
17 May 2016 (online)


Abstract

A new strategy for the synthesis of unsymmetrically disubstituted tetraphenylenes from 2-acetylbiphenylene has been developed via ruthenium-catalyzed C–H functionalization. Four reactions, including alkenylation–cyclization, alkenylation, alkylation, and amidation, were achieved. The reactions provide easy access to a variety of unsymmetrically disubstituted tetraphenylene derivatives, which could accelerate research on the appliation of tetraphenylenes.

Supporting Information

 
  • References and Notes

  • 3 Rajca A, Rajca S. Angew. Chem. Int. Ed. 2010; 49: 672
  • 8 Wang C, Xi Z. Chem. Commun. 2007; 5119
  • 13 Rapson WS, Shuttleworth RG, van Niekerk JN. J. Chem. Soc. 1943; 326
  • 14 Figeys HP, Dralants A. Tetrahedron Lett. 1971; 42: 3901
  • 19 For the detailed conditions optimization, see Supporting Information.
  • 23 Ru(II)-Catalyzed C–H Functionalization of 1a with 2a A 25 mL Schlenk-type tube (with a Teflon high-pressure valve and side arm) was charged with compound 1a (34.6 mg, 0.10 mmol), 2a (35.6 mg, 0.20 mmol), Cu(OAc)2·H2O (5.0 mg, 0.025 mmol), [RuCl2(p-cymene)]2 (6.1 mg, 0.01 mmol), AgSbF6 (13.7 mg, 0.04 mmol), and THF (1 mL). The reaction tube was evacuated and back-filled with N2 (3×, ballon). After the reaction mixture was stirred at 120 °C for 12 h, it was allowed to cool down to room temperature. The reaction mixture was diluted with EtOAc (20 mL), and then filtered through a pad of Celite. The filtrate was washed with brine (10 mL), dried over Na2SO4, and concentrated in vacuo. The residue was purified by silica gel preparative TLC to give the corresponding product 3a; yellow solid, 80% yield; mp 161–162 °C. 1H NMR (400 MHz, CDCl3): δ = 7.52 (s, 1 H), 7.31–7.13 (m, 23 H), 6.19 (s, 1 H), 5.69 (s, 1 H). 13C NMR (100 MHz, CDCl3): δ = 147.19, 141.85, 141.80, 141.66, 141.62, 141.55, 141.52, 141.46, 139.15, 138.06, 135.18, 134.48, 134.30, 130.61, 129.39, 129.12, 129.09, 129.06, 128.99, 128.22, 128.01, 127.40, 127.29, 127.26, 127.21, 126.95, 120.86, 120.80, 114.44. HRMS (ESI-TOF): m/z calcd for C40H26Na+: 529.1927 [M + Na]+; found: 529.1926.
  • 24 Ru(II)-Catalyzed C–H Functionalization of 1a with 4a A 25 mL Schlenk-type tube (with a Teflon high-pressure valve and side arm) was charged with compound 1a (34.6 mg, 0.10 mmol), 4a (25.6 mg, 0.20 mmol), Cu(OAc)2·H2O (39.9 mg, 0.20 mmol), [RuCl2(p-cymene)]2 (6.1 mg, 0.01 mmol), AgSbF6 (13.7 mg, 0.04 mmol), and t-BuOH (1 mL). The reaction tube was evacuated and back-filled with N2 (3×, ballon). After the reaction mixture was stirred at 110 °C for 12 h, it was allowed to cool down to room temperature. The reaction mixture was diluted with EtOAc (20 mL), and then filtered through a pad of Celite. The filtrate was washed with brine (10 mL), dried over Na2SO4, and concentrated in vacuo. The residue was purified by silica gel preparative TLC to give the corresponding product 5a; white solid, 76% yield; mp 195–196 °C. 1H NMR (400 MHz, CDCl3): δ = 8.13 (d, J = 15.9 Hz, 1 H), 7.55 (s, 1 H), 7.42 (s, 1 H), 7.35–7.29 (m, 6 H), 7.21–7.14 (m, 6 H), 6.28 (d, J = 15.9 Hz, 1 H), 4.18 (t, J = 6.7 Hz, 2 H), 2.58 (s, 3 H), 1.70–1.16 (m, 2 H), 1.44–1.38 (m, 2 H), 0.94 (t, J = 7.4 Hz, 3 H). 13C NMR (100 MHz, CDCl3): δ = 200.38, 166.53, 145.43, 143.35, 142.85, 141.51, 141.28, 140.84, 140.78, 139.82, 139.78, 136.86, 133.84, 130.17, 129.36, 129.31, 129.26, 129.20, 129.16, 128.73, 128.63, 128.07, 128.02, 127.58, 127.54, 127.49, 127.46, 120.99, 64.38, 30.67, 29.14, 19.12, 13.69. HRMS (ESI-TOF): m/z calcd for C33H28O3Na+: 495.1931 [M + Na]+; found: 495.1925.
  • 25 Ru(II)-Catalyzed C–H Functionalization of 1a with 6a A 25 mL septum-capped vial equipped with a magnetic stir bar was charged with compound 1a (34.6 mg, 0.10 mmol), 6a (57.0 mg, 0.30 mmol), HCO2Na (13.6 mg, 0.20 mmol), [RuCl2(p-cymene)]2 (6.1 mg, 0.01 mmol), and P(p-CF3C6H4)3 (23.3 mg, 0.05 mmol). The vial was closed and evacuated under vacuum during 10 min and placed under an argon atmosphere. Degassed dioxane (1 mL) was added, and the reaction vial was evacuated and back-filled with Ar (3×, ballon). After the reaction mixture was stirred at 100 °C for 12 h, it was allowed to cool down to room temperature. The reaction mixture was diluted with EtOAc (20 mL), and then filtered through a pad of Celite. The filtrate was washed with brine (10 mL), dried over Na2SO4, and concentrated in vacuo. The residue was purified by silica gel preparative TLC to give the corresponding product 7a; amorphous, 99% yield. 1H NMR (400 MHz, CDCl3): δ = 7.45 (s, 1 H), 7.33–7.27 (m, 6 H), 7.20–7.14 (m, 6 H), 7.12 (s, 1 H), 3.80 (q, J = 7.0 Hz, 6 H), 3.04–2.85 (m, 2 H), 2.54 (s, 3 H), 1.20 (t, J = 7.0 Hz, 9 H), 1.01–0.94 (m, 2 H). 13C NMR (100 MHz, CDCl3): δ = 201.55, 144.82, 143.87, 141.62, 141.26, 141.19, 141.15, 140.59, 140.48, 139.02, 136.16, 131.53, 130.17, 129.32, 129.30, 129.22, 129.10, 128.87, 127.68, 127.58, 127.39, 127.32, 58.31, 29.75, 26.94, 18.28, 12.48. HRMS (ESI-TOF): m/z calcd for C34H36O4SiNa+: 559.2275 [M + Na]+; found: 559.2270.
  • 26 Ru(II)-Catalyzed C–H Functionalization of 1a with 8a A 25 mL Schlenk-type tube (with a Teflon high pressure valve and side arm) was charged with compound 1a (34.6 mg, 0.10 mmol), 8a (54.9 mg, 0.30 mmol), Cu(OAc)2·H2O (10.0 mg, 0.05 mmol), [RuCl2(p-cymene)]2 (6.1 mg, 0.01 mmol), AgSbF6 (13.7 mg, 0.04 mmol), and CHCl3 (1 mL). The reaction tube was evacuated and back-filled with N2 (3×, ballon). After the reaction mixture was stirred at 100 °C for 24 h, it was allowed to cool down to room temperature. The reaction mixture was diluted with EtOAc (20 mL), and then filtered through a pad of Celite. The filtrate was washed with brine (10 mL), dried over Na2SO4, and concentrated in vacuo. The residue was purified by silica gel preparative TLC to give the corresponding product 9a; white solid, 70% yield; mp 244–245 °C. 1H NMR (400 MHz, CDCl3): δ = 11.35 (s, 1 H), 7.72 (d, J = 7.4 Hz, 2 H), 7.56 (s, 1 H), 7.52 (s, 1 H), 7.49 (t, J = 7.5 Hz, 1 H), 7.37–7.26 (m, 8 H), 7.20–7.12 (m, 4 H), 7.09–7.07 (m, 1 H), 6.99–6.97 (m, 1 H), 2.46 (s, 3 H). 13C NMR (100 MHz, CDCl3): δ = 201.99, 148.46, 141.74, 140.99, 140.90, 140.73, 139.74, 139.58, 139.11, 138.67, 136.64, 132.88, 132.32, 129.32, 129.26, 129.24, 129.00, 128.83, 128.80, 128.26, 128.22, 127.90, 127.51, 127.48, 127.47, 127.28, 121.55, 119.98, 28.08. HRMS (ESI-TOF): m/z calcd for C32H23 NO3SNa+: 524.1291 [M + Na]+; found: 524.1294.