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note
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N-Boc-, N-tosyl-, N-phenyl-, N-benzhydryl-, and N-phosphinoyl-protected imines gave inferior results compared to the N-benzyl-protected ones. As cyanide sources we tested acetone cyanohydrine, trimethylsilyl cyanide, and HCN. Reduction of catalyst loading, temperature, and concentration resulted in loss of enantioselectivities.
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note
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Enantioselectivities decreased in the case of aliphatic imines, for example, 2-(benzylamino)-3-methylbutane nitrile was obtained in 55% ee.
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