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23
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51149093762
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Benzaldehyde (0.10 mL, 0.98 mmol) and catalyst 5, 6, 8, or 9 (0.1-10 mol, were dissolved in freshly distilled CH2Cl 2 (5 mL, Trimethylsilyl cyanide (0.14 mL, 1.08 mmol, 1.1 equiv) was added, and the reaction was stirred at r.t. overnight. The resulting solution was filtered through a pad of SiO2 using CH2Cl2 as eluent. Solvent was removed in vacuo to give mandelonitrile trimethylsilyl ether as a yellow oil. The conversion was determined by 1H NMR spectroscopy. The mandelonitrile trimethylsilyl ether and Sc(OTf)3 (1 mol, were then dissolved in MeCN (5 mL, and Ac2O (2.0 equiv) was added. The reaction mixture was stirred at r.t. for 20 min, then filtered through a pad of SiO2 using CH2Cl2 as eluent. Solvent was removed in vacuo to give mandelonitrile acetate as a yellow oil which was analysed by chiral GC to determine its ee
-
2 as eluent. Solvent was removed in vacuo to give mandelonitrile acetate as a yellow oil which was analysed by chiral GC to determine its ee.
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34247881749
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For a discussion of the stereochemistry of octahedral metal complexes bearing salen ligands as it applies to asymmetric cyanohydrin synthesis, see: Belokon, Y. N, Clegg, W, Harrington, R. W, Young, C, North, M. Tetrahedron 2007, 63, 5287
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For a discussion of the stereochemistry of octahedral metal complexes bearing salen ligands as it applies to asymmetric cyanohydrin synthesis, see: Belokon', Y. N.; Clegg, W.; Harrington, R. W.; Young, C.; North, M. Tetrahedron 2007, 63, 5287.
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