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1
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0000796911
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4 is known to cleave diols in the presence of sulfides. For a recent example, see: Hong, C. Y.; Kishi, Y. J. Am. Chem. Soc. 1992, 114, 7001.
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0001135485
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2 Stork, G.; van Tamelen, E. E.; Friedman, L. J.; Burgstahler, A. W. J. Am. Chem. Soc. 1953, 75, 394; Djerasi, C.; Engle, R. R. J. Am. Chem. Soc. 1953, 75, 3838; Henbest, H. B.; Khan, S. A. J. Chem. Soc. Chem. Commun. 1968, 1036; Vyas, D. M. ; Hay, C. W. Can. J. Chem. 1975, 53, 1362; Vedejs, E.; McClure, C. K. J. Am. Chem. Soc. 1986, 108, 1094.
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9
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0001610101
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5 Ferricyanide was first reported as a cooxidant for osmium tetroxide catalyzed dihydroxylations by Yamamoto and coworkers. See: Minato, M.; Yamamoto, K.; Tsuji, J. J. Org. Chem. 1990, 55, 766.
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0028954582
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We chose to use the protocol described in this paper without added amines since the Sharpless AD procedure, which we have also examined, contains amines, and since Kaldor has shown that sulfide oxidation is accelarated by amines (see ref 3). Warren has reported an achiral ligand accelerated dihydroxylation using quinuclidine which is similar to the Yamamoto procedure. See: Eames, J.; Mitchell, H. J,; Nelson, A.; O'Brien, P.; Warren, S.; Wyatt, P. Tetrahedron Lett., 1995, 36, 1719.
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12
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85030202694
-
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note
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7 In all cases, authentic samples of products were prepared and used as standards.
-
-
-
-
13
-
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85030205222
-
-
note
-
4 and concentrated and purified by flash chromatography (hexanes, then 1:1 hexanes / ethyl acetate, then ethyl acetate) to provide the desired diol (46 mg,, 80%).
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-
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14
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85030207750
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note
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9 We could not detect any bis-sulfoxides from the dithiane reactions. We suspect that oxidation to the mono-sulfoxide deactivates the remaining sulfide towards further oxidation.
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15
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4444276636
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0025096666
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11 Matthews, D. E.; Durbin, R. D. J. Biol. Chem. 1989, 265, 493. Steinberg, T.; Matthews, D. E. ; Durbin, R. D.; Burgess, R. R.; J. Biol. Chem. 1989, 265, 499.
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33947094224
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