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Volumn , Issue 19, 2002, Pages 3243-3249

A convenient catalytic procedure for the addition of trimethylsilyl cyanide to functionalised ketones, mediated by InBr3 - Insight into the reaction mechanism

Author keywords

Catalysis; Cyanides; Indium; Ketones; Kinetics

Indexed keywords

ALIPHATIC KETONE; AROMATIC COMPOUND; CYANIDE; CYANOHYDRIN; INDIUM; INDIUM BROMIDE; KETONE DERIVATIVE; SILANE DERIVATIVE; TRIMETHYLSILYL DERIVATIVE; TRIMETHYLSILYLCYANIDE; UNCLASSIFIED DRUG;

EID: 0036794024     PISSN: 1434193X     EISSN: None     Source Type: Journal    
DOI: 10.1002/1099-0690(200210)2002:19<3243::AID-EJOC3243>3.0.CO;2-E     Document Type: Article
Times cited : (80)

References (60)
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    • Aldol reaction: T.-P. Loh, J. Pei, G.-Q. Cao, Chem. Commun. 1996, 1819-1820. S. Kobayashi, T. Busujima, S. Nagayama, Tetrahedron Lett. 1998, 39, 1579-1582; T.-P. Loh, L.-L. Wei, Tetrahedron Lett. 1998, 39, 323-326.
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    • 3 has already been studied as a catalyst (30 mol%) in the cyanation of aldehyde compounds in water (see: T.-P. Loh, K.-C. Xu, D. S.-C. Ho, K.-Y. Sim, Synlett 1998, 369-370); aliphatic and aromatic ketones did not undergo cyanation with TMSCN in this catalytic procedure, however.
    • (1998) Synlett , pp. 369-370
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    • note
    • When tributyltin cyanide was used as the cyano source, 2 was obtained in lower yield (62%).
  • 40
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    • note
    • 3 10 mol%)
  • 44
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    • note
    • 1H NMR analysis of the crude mixture. The higher reaction rate of 21 in comparison with 25 is explained in terms of a reduction in the transition state energy associated with preformation of the indium/25 complex. The more selective substrate is therefore the more reactive.
  • 45
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    • The capability of the indium(III) species to bind multidentate substrates persists even in aqueous media, see:[25a] L. A. Paquette, T. M. Mitzel, J. Am. Chem. Soc. 1996, 118, 1931-1937.
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    • note
    • This result does not rule out the existence of a dimeric adduct; in fact, it is possible that the active dimeric species is an equilibrium intermediate present in a low concentration below the sensitivity of the NMR measurement.
  • 54
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    • For experimental evidence of transmetallation reactions between indium(III) salts and tetraalkyltin compounds, see ref.[15] and; J. Cossy, C. Rasamison, D. G. Pardo, J. A. Marshall, Synlett 2001, 629-633.
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  • 56
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    • note
    • No transmetallation reaction was observed even under forcing experimental conditions with an excess of TMSCN.
  • 57
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    • Although it has been clearly documented that trimethylsilyl cyanide and isocyanide exist in labile equilibrium in solution (normalliso ≈ 90: 10), no evidence of the active isocyanide form was observed in our spectroscopic investigations: [33a] M. R. Booth, S. G. Frankiss, Spectrochim. Acta 1970, 26A, 859-869.
    • (1970) Spectrochim. Acta , vol.26 A , pp. 859-869
    • Booth, M.R.1    Frankiss, S.G.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.