Synlett 2010(7): 1071-1074  
DOI: 10.1055/s-0029-1219778
LETTER
© Georg Thieme Verlag Stuttgart ˙ New York

Copper(I)-Catalyzed Synthesis of Polysubstituted Furans from Alkynoates and 1,3-Dicarbonyl Compounds in the Presence of Oxygen

Rulong Yan, Jing Huang, Jia Luo, Ping Wen, Guosheng Huang*, Yongmin Liang*
State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. of China
Fax: +86(931)8912582; e-Mail: hgs@lzu.edu.cn; e-Mail: liangym@lzu.edu.cn;
Further Information

Publication History

Received 15 January 2010
Publication Date:
17 March 2010 (online)

Abstract

A novel and straightforward synthesis of polysubstituted furans was achieved easily from the oxidative cyclization of 1,3-dicarbonyl compound and alkynoate catalyzed by CuI in the presence of O2.

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11

General Procedure for the Preparation of Dimethyl But-2-yndioate and 1,3-Diphenyl-1,3-propanedione (3aa)
An oven-dried Schlenk tube was charged with CuI (9.5 mg, 0.05 mmol), 1a (0.50 mmol), and 2a (0.50 mmol). The Schlenk tube was sealed and then evacuated and backfilled with oxygen (3 cycles). Then DMF (2 mL) was added to the reaction system. The reaction was stirred at 110 ˚C under O2 (1 atm) for 4 h. After cooling to r.t., the solvent diluted with Et2O (10 mL) and washed with brine (5 mL) and dried over anhyd Na2SO4. After the solvent was evaporated in vacuo, the residues were purified by column chromatography, eluting with PE-EtOAc (10:1) to afford pure 3aa.
Dimethyl 4-Benzoyl-5-phenylfuran-2, 3-dicarboxylate (3aa) Yellow viscous oil. ¹H NMR (400 MHz CDCl3): δ = 3.61 (s, 3 H), 3.96 (s, 3 H), 7.29-7.39 (m, 5 H), 7.50-7.54 (m, 1 H), 7.61-7.63 (m, 2 H), 7.79-7.81 (m, 2 H). ¹³C NMR (100 MHz, CDCl3): δ = 52.4, 52.5, 121.5, 126.2, 127.4, 127.6, 128.5, 128.6, 129.3, 130.2, 133.6, 136.7, 141.1, 155.3, 157.7, 161.9, 190.0. IR (neat): 694, 772, 899, 1080, 1167, 1235, 1443, 1666, 1730, 2953, 3004, 3062 cm. HRMS (EI): m/z calcd for C21H16O6 [M + H]+: 365.1020; found: 365.1029.
The ¹H NMR, ¹³C NMR, IR, and HRMS data of 3aa-bb can be found in the Supporting Information.