Under control: A chiral imidazoline–aminophenol/Ni(OAc)2 complex promotes the first catalytic asymmetric exo′-selective [3+2] cycloaddition of iminoesters and nitroalkenes. Thermodynamic control over the stepwise Michael/Mannich cyclization steps gives the adducts in up to 99 % ee.
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Arai et al. (2010) studied this question.
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