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Oompa loompa: The title reaction has been accomplished with high stereoselectivity by use of an axially chiral dicarboxylic acid (see scheme). Employment of vinylogous aza-enamines as novel dipolarophiles was also implemented to establish a new concept of the inverse-electron-demand umpolung 1,3-dipolar cycloaddition. Bz=benzoyl, EDG=electron-donating group.
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Hashimoto et al. (2011) studied this question.
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