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In addition to the general procedure, the reaction was carried out under different conditions, e.g., (a) to a suspension of L-proline in dry DMF at 4°C, a solution of aldehydes 2 (1.0 equiv) and n-hexanal 3k (1.0 equiv) was added over 22 h, (b) by changing the mole proportions such as using 2 (2.0 equiv) and 3k (1.0 equiv), and (c) a solution of 2 (2.0 equiv), 3k (1.0 equiv), and proline (0.2 equiv) in dry DMF was stirred at 4°C for overnight. All of the attempts led to an inseparable mixture of products.
-
In addition to the general procedure, the reaction was carried out under different conditions, e.g., (a) to a suspension of L-proline in dry DMF at 4°C, a solution of aldehydes 2 (1.0 equiv) and n-hexanal 3k (1.0 equiv) was added over 22 h, (b) by changing the mole proportions such as using 2 (2.0 equiv) and 3k (1.0 equiv), and (c) a solution of 2 (2.0 equiv), 3k (1.0 equiv), and proline (0.2 equiv) in dry DMF was stirred at 4°C for overnight. All of the attempts led to an inseparable mixture of products.
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(b) Sakthivel, K.; Notz, W.; Bui, T.; Barbas, C. F., Jr. J. Am. Chem. Soc. 2001, 123, 5260-5267.
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Hoang, L.1
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Crystal data for 1c: C11H11NO5, MW, 237.21, T, 293(2) K, Monoclinic, P21, a, 6.0650(10) Å, b, 5.9654(9) Å, c, 14.695(2) Å, β, 91.142(5)°. V, 531.55(15) Å3. Z, 2, ρcalcd, 1.482 Mg/m3, μ, 0.119 mm-1, γ, 0.71073 Å, 2θmax, 56.64, reflection collected/unique, 7909/2797, Rint, 0.0264, R1, 0.0444, wR2, 0.1020 for 2150 reflections [I > 2σ (I, Flack(x) parameter, 0.010
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int = 0.0264, R1 = 0.0444, wR2 = 0.1020 for 2150 reflections [I > 2σ (I)], Flack(x) parameter = 0.0(10).
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