Curiosity killed the CAT…︁ions! The use of stabilized cationic intermediates can be considered as a new frontier in the development of stereoselective reactions. An organocatalytic procedure mediated by the MacMillan imidazolidinone catalyst was coupled with an InBr3-mediated process for the development of a novel stereoselective allylation reaction of aldehydes. Up to 98 % ee and up to 5:1 d.r. were obtained in the process.
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Capdevila et al. (2010) studied this question.
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