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A facile thermodynamic cyclopropanation of trisubstituted olefinic azlactones with a stock solution of CF3CHN2 in CH3CN is realized. This method shows excellent generality, affording a wide range of trifluoromethyl-substituted cyclopropanes bearing azlactone rings in good to high yields and diastereoselectivities. With the products in hand, the trifluoromethyl-substituted cyclopropane α-amino acids and relative peptide derivatives could be readily obtained.
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Zhu et al. (2015) studied this question.
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