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Wirth, T, Ed, Springer: Berlin
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(a) Hypervalent Iodine Chemistry; Wirth, T., Ed.; Springer: Berlin, 2003.
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Hypervalent Iodine Chemistry
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Zhdankin, V.V.5
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0036811250
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For reviews on tagged reagents, see: a
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For reviews on tagged reagents, see: (a) Barrett, A. G. M.; Hopkins, B. T.; Köbberling, J. Chem. Rev. 2002, 102, 3301.
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Barrett, A.G.M.1
Hopkins, B.T.2
Köbberling, J.3
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(c) Ficht, S.; Mülbaier, M.; Giannis, A. Tetrahedron 2001, 57, 4863.
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(g) Sorg, G.; Mengel, A.; Jung, G.; Rademann, J. Angew. Chem. Int. Ed. 2001, 40, 4395;
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(b) Katritzky, A. R.; Savage, G. P.; Gallos, J. K.; Durst, H. D. J. Chem. Soc., Perkin Trans. 2 1990, 1515.
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Katritzky, A.R.1
Savage, G.P.2
Gallos, J.K.3
Durst, H.D.4
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Improved Procedure for the Preparation of m- Iodosylbenzoic Acid (2, m-Iodobenzoic acid (1; 2.48 g, 10 mmol) was added at 40°C to a freshly prepared solution of peracetic acid in AcOH [prepared by stirring a mixture of Ac2O (60 mL) and 35% H 2O2 (14 mL) at 40°C for 4 h in dark] and the resulting mixture was stirred for 12 h at ambient temperature in dark. A spontaneous heating of the reaction mixture up to 45°C and complete dissolution of m-iodobenzoic acid was observed during the first two hours of stirring. The reaction mixture was poured onto ice-water (150 mL, and allowed to crystallize. The precipitate was filtered on a Büchner funnel and washed with ice-water (200 mL, The solid was then dried, first by maintaining suction and then in vacuum, to afford product 2 as a light yellow powder. Yield: 1.90-2.11 g (72-80% yield, mp 168-169°C. 1H NMR 200 MHz, CD3
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3 (263.93): C, 31.84; H, 1.91. Found: C, 31.77; H, 1.84.
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33947198382
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RuCl3-Catalyzed Oxidation of Alcohols to Carbonyl Compounds: Method A: To a mixture of alcohol (0.05-0.20 mmol) and m-iodosylbenzoic acid (2; 0.075-0.300 mmol, 1.5 equiv) in aq MeCN (MeCN-H2O, 5:1; 0.5-2 mL) an aqueous solution of RuCl3 (1.0-4.0 μL of 0.25 M solution; 0.25-1.0 μmol) was added under stirring at r.t. An instantaneous formation of a cotton-like, off-white precipitate was observed. The reaction mixture was stirred for a period of time indicated in Figures 1 and 2 (the reactions were monitored by TLC, Then, CH 2Cl2 (1.5 mL) and IRA 900 (hydroxide form; 160-620 mg) were added and the mixture was stirred for 5 min. The polymer was removed by filtration and the solution was concentrated under vacuum to afford the NMR-pure carbonyl compound. Most products were additionally identified as 2,4-dinitrophenylhydrazones, prepared by the treatment of reaction mixtures with a standard solution of 2,4-din
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2O from the extract; most prepared carbonyl compounds were additionally identified as their 2,4-dinitrophenylhydrazones. The aqueous solution that was left after extraction was acidified with HCl, and the white precipitate of m-iodobenzoic acid was separated by filtration and used for regeneration of reagent 2.
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33947269398
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In one case we encountered further oxidation to galacturonic acid when 1,2:3,4-di-O-isopropylidene-α-D-galactopyranose was employed (Scheme 2). (Chemical Equation Presented)
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In one case we encountered further oxidation to galacturonic acid when 1,2:3,4-di-O-isopropylidene-α-D-galactopyranose was employed (Scheme 2). (Chemical Equation Presented)
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This is particularly well demonstrated for the formation of ulose 4r which can undergo facile elimination of methanol to the corresponding enulose
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This is particularly well demonstrated for the formation of ulose 4r which can undergo facile elimination of methanol to the corresponding enulose.
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