Phase-transfer conditions can be used to synthesize (−)- or (+)-cis-acetylenyl-N-sulfonylaziridines (for example 3) by the reaction of N-sulfonylimines(1) with chiral sulfonium propargylides (2) derived from D-(+)-camphor. High cis selectivity and yields as well as moderate to good ee values are characteristic for these aziridinations.
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Li et al. (1997) studied this question.
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