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One-pot, three-component cycloaddition of aldehydes, diethyl α-aminomalonates and nitroalkenes has been very recently reported with exo-selectivity in racemic form without catalysts. Thiourea catalysts reduce the diastereolselectivity significantly. See: L. Crovetto, R. Rios, Synlett 2008, 1840-1844.
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55449111849
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The combination of thiourea-tertiary amine 1a and AgF could not catalyze the dipolar cycloaddition because of the preferable formation of the thiourea-Ag complex. However, urea-tertiary amine 1b-AgF promoted the cycloaddition (Table 1, entry 3).
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c) The combination of thiourea-tertiary amine 1a and AgF could not catalyze the dipolar cycloaddition because of the preferable formation of the thiourea-Ag complex. However, urea-tertiary amine 1b-AgF promoted the cycloaddition (Table 1, entry 3).
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The absolute configuration of 4 has not yet been determined. It was assigned based on the concerted catalytic mode by Takemoto et al.: T. Okino, Y. Hoashi, T. Furukawa, X. Xu, Y. Takemoto, J, Am. Chem. Soc. 2005, 127, 119-125. Please see Supporting Information.
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The absolute configuration of 4 has not yet been determined. It was assigned based on the concerted catalytic mode by Takemoto et al.: T. Okino, Y. Hoashi, T. Furukawa, X. Xu, Y. Takemoto, J, Am. Chem. Soc. 2005, 127, 119-125. Please see Supporting Information.
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66
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The direct Michael addition of diethyl α-aminomalonate to nitroalkenes, catalyzed by lb, could not proceed in the absence of aldehydes
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The direct Michael addition of diethyl α-aminomalonate to nitroalkenes, catalyzed by lb, could not proceed in the absence of aldehydes.
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67
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The Michael adducts have been proposed as intermediates in the [3+2] cycloaddition of azomethine ylides. See ref. 4 and ref. 9.
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The Michael adducts have been proposed as intermediates in the [3+2] cycloaddition of azomethine ylides. See ref. 4 and ref. 9.
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68
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Thiourea-pyrrole catalysts 1h-m were prepared in a similar procedure to 1g, reported by Taylor and Jacobsen. See: M.S. Taylor, E. N. Jacobsen, J. Am. Chem. Soc. 2004, 126, 10558-10559.
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Thiourea-pyrrole catalysts 1h-m were prepared in a similar procedure to 1g, reported by Taylor and Jacobsen. See: M.S. Taylor, E. N. Jacobsen, J. Am. Chem. Soc. 2004, 126, 10558-10559.
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