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Reports appeared while this work was being completed that confirmed the validity of this approach: see ref 5i and 51.
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The use of other solvents (toluene, dichloromethane, dichloroethane, THF, DME) led to lower yields and ee. The best result (25% yield, 42% ee) was observed in dichloromethane.
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It must be noted that both 10 and 11 are less sterically hindered and, hence, are likely to be better catalysts than 5b because they can have a stronger N-oxide/silicon interaction.
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