Synlett 2007(3): 0407-0410  
DOI: 10.1055/s-2007-967954
LETTER
© Georg Thieme Verlag Stuttgart · New York

Oxidative Conversion of Primary Alcohols, and Primary, Secondary, and Tertiary Amines into the Corresponding Nitriles with 1,3-Diiodo-5,5-dimethylhydantoin in Aqueous NH3

Shinpei Iida, Hideo Togo*
Graduate School of Science and Technology, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan
e-Mail: togo@faculty.chiba-u.jp;
Further Information

Publication History

Received 27 November 2006
Publication Date:
07 February 2007 (online)

Abstract

Various primary alcohols, and primary, secondary, and tertiary amines were oxidatively and efficiently converted into the corresponding nitriles in good yields, by 1,3-diiodo-5,5-dimethylhydantoin (DIH) in aqueous ammonia (NH3) at 60 °C.

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Typical Experimental Procedure for Oxidative Conversion of Primary Alcohols into Nitriles:9 To a mixture of dodecanol (186.3 mg, 1 mmol) and aq NH3 (3.0 mL, 45 mmol) was added DIH (731.9 mg, 2.0 mmol) at r.t. under an empty balloon. The obtained mixture was stirred at 60 °C. After 32 h at the same temperature, the reaction mixture was quenched with H2O (20 mL) and sat. aq Na2SO3 (3 mL) at 0 °C, and was extracted with Et2O (3 × 15 mL). The organic layer was washed with brine and dried over Na2SO4 to provide lauronitrile in 97% yield in an almost pure state. If necessary, the product was purified by column chromatography on silica gel (hexane-EtOAc, 4:1) to give pure lauronitrile in 97% yield as a colorless oil. IR (NaCl): 2250 cm-1. 1H NMR (400 MHz, CDCl3): δ = 0.88 (t, J = 7.0 Hz, 3 H), 1.29 (br, 14 H), 1.45 (quin, J = 7.1 Hz, 2 H), 1.66 (quin, J = 7.1 Hz, 2 H), 2.34 (t, J = 7.1 Hz, 2 H). The product was identified by comparison with the commercially available authentic compound.
Typical Experimental Procedure for Oxidative Conversion of Primary Amines into Nitriles:9 To a mixture of dodecylamine (185.4 mg, 1 mmol) and aq NH3 (3.0 mL, 45 mmol) was added DIH (439.1 mg, 1.2 mmol) at r.t. under an empty balloon. The obtained mixture was stirred at 60 °C. After 6 h at the same temperature, the reaction mixture was quenched with H2O (20 mL) and sat. aq Na2SO3 (3 mL) at 0 °C, and was extracted with Et2O (3 × 15 mL). The organic layer was washed with brine and dried over Na2SO4 to provide lauronitrile in 88% yield in an almost pure state. If necessary, the product was purified by column chromatography on silica gel (hexane-EtOAc, 4:1) to give pure lauronitrile as a colorless oil.

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All nitriles gave satisfactory spectroscopic data and were identified by comparison with commercially available authentic materials.