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33751551747
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See Ref. 6c;
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0347683357
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33751513112
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(a) See Ref. 6g;
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22
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4544308024
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Other microwave-assisted solvent-free reactions of azomethine ylides:
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Pospíšil J., and Potáček M. Eur. J. Org. Chem. (2004) 710-716 Other microwave-assisted solvent-free reactions of azomethine ylides:
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Pospíšil, J.1
Potáček, M.2
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note
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This very polar fraction, which sticks on the silica gel, presented a very complicated mixture of probably decomposed reaction intermediates, which was not possible to analyze. At first, we have expected the formation of product of the Claisen rearrangement, however, this product was not observed in the reaction mixture.
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0000557199
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Laurent R., Laporterie A., Dubac J., Berlan J., Lefeuvre R., and Audhuy M. J. Org. Chem. 57 (1992) 7099-7102
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33751532768
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note
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The condensation of the water was observed above the open reaction vessel in the course of the reaction.
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39
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2442431500
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This reaction is possible to extend to other aldehydes as well as N-alkyl 2-alkylaminoacetamides and represents an elegant way for the preparation of 1,2,3-trialkyl substituted imidazolin-4-ones. Desired compounds are formed generally in 5 min (200 °C, μW) in 90-96% yields. Interestingly, the reaction is possible to carry out under the classical heating with comparable yields, however, the reaction times are longer (30 min). See:
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This reaction is possible to extend to other aldehydes as well as N-alkyl 2-alkylaminoacetamides and represents an elegant way for the preparation of 1,2,3-trialkyl substituted imidazolin-4-ones. Desired compounds are formed generally in 5 min (200 °C, μW) in 90-96% yields. Interestingly, the reaction is possible to carry out under the classical heating with comparable yields, however, the reaction times are longer (30 min). See:. Pospíšil J., and Potáček M. Heterocycles 63 (2004) 1165-1173
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33751502866
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note
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Interestingly, no products of the intermolecular reaction (dimers, trimers,...) were observed in the reaction mixture (GC-MS).
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41
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33751506202
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note
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a of the equivalent hydrogen atom attached to the carbon next to ester group is ∼28. The values are valid in DMSO (see Ref. 11).
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43
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note
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Stabilities of aldehyde 4, amines 18a-c and cycloadducts 20a-c under the reaction conditions were tested and all the compounds were reisolated in >85% yield. Typical temperature profile of the reaction is presented in Graph S-1 and can be found in Supplementary data.
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0023043811
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1H NMR. See Supplementary data Graph S-2.
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