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DOI: 10.1055/s-2006-926268
Synthesis of 3-Phenylsulfanyl-1,2-dihydronaphthalenes from Methylenecyclopropanes and Benzenethiol
Publication History
Publication Date:
06 February 2006 (online)
Abstract
Reaction of methylenecyclopropanes and benzenethiol in the presence of azobisisobutyronitrile gave 3-phenylsulfanyl-1,2-dihydronaphthalenes selectively.
Key words
methylenecyclopropanes - benzenethiol - radicals - radical reactions
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General Methods for the Synthesis of 3-Phenyl-sulfanyl-1,2-dihydronaphthalenes ( 9).
Under a nitrogen atmosphere, a solution of AIBN (0.3 mmol) and benzenethiol (0.3 mmol) in toluene (10 mL) was dropped very slowly into a solution of 1a (0.3 mmol) in toluene (10 mL) for 2 h at 110 °C and then kept at this temperature for 30 min. Then the solvent was evaporated under vacuum and the residue was subjected to preparative TLC (eluent: PE) to afford the product 9a (70 mg, 74%). -
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Selected Data for 9a. Oil. 1H NMR (400 MHz, CDCl3): δ = 6.71-7.49 (m, 14 H), 2.94 (t, J = 8.0 Hz, 2 H), 2.57 (t, J = 8.0 Hz, 2 H). 13C NMR (100 MHz, CDCl3): δ = 29.3, 29.4, 126.2, 126.6, 126.8, 127.2, 128.1, 128.7, 129.5, 129.9, 130.8, 132.0, 134.9, 135.1, 136.1, 138.9. IR (KBr): 2926, 2358, 1648, 1475, 1075, 745, 700 cm-1. MS (EI, 70 eV): m/z (%) = 314 (100) [M+], 315 (32) [M + H+], 203 (44).
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