The addition of TMSCN to ketones catalyzed by complex of racemic N-(2'-pyridylmethyl)-2-diphenylhydroxymethylpyrrolidine N-oxide (rac-1) or N-benzyl-N,N-dihydroxyethylamine N-oxide and Ti(iPrO)(4) affords the racemic O-TMS cyanohydrins in good to excellent isolated yields (up to 97%) under mild reaction conditions.
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Shen et al. (2002) studied this question.