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Volumn 82, Issue 3, 2009, Pages 381-392

Conversion of alcohols to alkyl aryl sulfides by a new type of oxidation-reduction condensation using phenyl diphenylphosphinite

Author keywords

[No Author keywords available]

Indexed keywords

ARYL SULFIDES; BENZOQUINONE; BENZOTHIAZOLE; CHIRAL SULFIDES; INVERSION OF CONFIGURATIONS; NEUTRAL CONDITIONS; TERTIARY ALCOHOLS;

EID: 63149135434     PISSN: 00092673     EISSN: 13480634     Source Type: Journal    
DOI: 10.1246/bcsj.82.381     Document Type: Article
Times cited : (21)

References (88)
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    • N2 displacement at a quaternary center with various nucleophiles, see: a) Y.-J. Shi, D. L. Hughes, J. M. McNamara, Tetrahedron Lett. 2003, 44, 3609.
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    • For reviews of oxidation-reduction condensation, see: a
    • For reviews of oxidation-reduction condensation, see: a) T Mukaiyama, H. Yamabe, Chem. Lett. 2007, 36, 1.
    • (2007) Chem. Lett , vol.36 , pp. 1
    • Mukaiyama, T.1    Yamabe, H.2
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    • 0041854724 scopus 로고    scopus 로고
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    • For carbon-oxygen bond formation reactions, see: a) T. Mukaiyama, T. Shintou, K. Fukumoto, J. Am. Chem. Soc. 2003, 125, 10538.
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    • For carbon-nitrogen bond formation reactions, see: a) K. Kuroda, Y. Hayashi, T. Mukaiyama, Tetrahedron 2007, 63, 6358.
    • (2007) Tetrahedron , vol.63 , pp. 6358
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    • The effect of azide compounds as oxidants is considered as follows. When 1-azidoadamantane was used, intermediate A was not converted into intermediate B because the bulky substituent retarded the attack of alcohol la to the positively charged phosphorus atom. On the other hand, intermediate A was not formed in the case of DPPA with electron-withdrawing groups because the basicity of an iminophosphorane is very low. In the case of TMSN3, since the Staudinger reaction rate with PhOPPh2 was very slow, an iminophosphorane was not formed efficiently. Thus, it is proven that alkyl azides such as ethyl azidoacetate or benzyl azide are a suitable oxidant
    • 2 was very slow, an iminophosphorane was not formed efficiently. Thus, it is proven that alkyl azides such as ethyl azidoacetate or benzyl azide are a suitable oxidant.
  • 87
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    • The yield of the desired sulfide obtained by using an azide was lower than that using a benzoquinone derivative only when a sulfur nucleophile having a high pKa value such as benzenethiol or 4-methoxybenzenethiol was used. This indicates that the basicity of iminophosphorane is lower than that of phenoxide anion of intermediate A Scheme 2, On the other hand, reaction of BtzSH with tertiary alcohol Ir gave the desired sulfide along with undesired olefins. Since the yield of the desired product obtained by using an azide is higher than that using a benzoquinone derivative, the reaction using an azide might suppress undesired side reactions such as competitive E2 elimination caused by the iminophosphorane while the reaction using a benzoquinone derivative might promote E2 elimination caused by the phenoxide anion. Thus, the reaction using an azide proceeds under milder conditions to afford the desired product in higher yield
    • a value such as benzenethiol or 4-methoxybenzenethiol was used. This indicates that the basicity of iminophosphorane is lower than that of phenoxide anion of intermediate A (Scheme 2). On the other hand, reaction of BtzSH with tertiary alcohol Ir gave the desired sulfide along with undesired olefins. Since the yield of the desired product obtained by using an azide is higher than that using a benzoquinone derivative, the reaction using an azide might suppress undesired side reactions such as competitive E2 elimination caused by the iminophosphorane while the reaction using a benzoquinone derivative might promote E2 elimination caused by the phenoxide anion. Thus, the reaction using an azide proceeds under milder conditions to afford the desired product in higher yield.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.