The N-t-butyl and N-benzyl aziridine carboxylic acid phenylthiol esters are deprotonated in the α-carbonyl position and alkylated by alkyl halides, by aldehydes, and by nitrostyrene. The diastereoselectivities in the additions to trigonal centers range from 72 to 88% (rel. topicity lk with benzaldehyde).
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Seebàch et al. (1987) studied this question.
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