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The stereospecific cis addition of “TsN” and H2O yields α-hydroxy-N-tosylamines (see below). This osmium-catalyzed process, which depends on Chloramine-T as the nitrenoid source, is rendered asymmetric in the presence of cinchona alkaloid ligands. The selectivities for reactions of the six olefins studied range from 33% ee (cis-stilbene) to 81% ee (trans-methylcinnamate). The active agent is presumably the compound Os(O)3NTs shown in square brackets. (DHQ)2-PHAL = bis(dihydro-quininyl)phthalazine (see preceding communication).
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Li et al. (1996) studied this question.
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