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Choose the right cat.: A highly enantioselective synthesis of oxazolin-4-ones by the formal [3+2] cycloaddition of ketenes and a racemic oxaziridines has been developed (see scheme; cat.=N-heterocyclic carbenes for disubstituted ketenes or cinchona alkaloids for monosubstituted ketenes, Ts=4-toluenesulfonyl).
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Pan‐Lin Shao (2010) studied this question.
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