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The aza-Darzens reaction of the chiral enolate derived from bromoacetylcamphorsultam 1 with N-(diphenyl-phosphinyl)aryl- and tert-butyl-methanimines proceeds in good yield to give cis-N-(diphenylphosphinyl)aziridinylcarbonyl sultams with high de. Monochiral cis-aziridinecarboxylates may be obtained in acceptable yield by hydrolysis of these sultams.
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Cantrill et al. (1996) studied this question.
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