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0034665244
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Passerini three-component and Ugi four-component condensations are the most popular among many other reactions for their wide scope and synthetic utility. For reviews, see: (a) Bienaymé, H.; Hulme, C.; Oddon, G.; Schmitt, P. Chem. Eur. J. 2000, 6, 3321. (b) Dömling, A.; Ugi, I. Angew. Chem., Int. Ed. 2000, 39, 3168.
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Passerini three-component and Ugi four-component condensations are the most popular among many other reactions for their wide scope and synthetic utility. For reviews, see: (a) Bienaymé, H.; Hulme, C.; Oddon, G.; Schmitt, P. Chem. Eur. J. 2000, 6, 3321. (b) Dömling, A.; Ugi, I. Angew. Chem., Int. Ed. 2000, 39, 3168.
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Quite fairly, Biginelli stated (ref3) that his research was inspired by the earlier work of R. Behrend on the urea-ketoester coupling and U. Schiff on the urea-aldehyde coupling.
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41
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For a recent report on the synthesis of new guanidine-sugars and leading references to earlier work on these glycoconjugates, see: Lin, P.; Lee, C. L.; Sim, M. M. J. Org. Chem. 2001, 66, 8243.
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It has to be noted that the β-D-configured formyl C-ribofuranoside 5a was erroneously reported (ref 22b) to be the α-isomer. For a revision, see: Dondoni, A.; Formaglio, P.; Marra, A.; Massi, A. Tetrahedron 2001, 57, 7719.
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2142823795
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note
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The attachment of the sugar moiety to the urea through a methylene bridge was designed in order to ensure higher stability with respect to the N-glycosyl derivative.
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55
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37049078654
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2142714034
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note
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The use of catalytic CuCl as described in ref 7f afforded the Biginelli product in much lower yield (ca. 30%). It is likely that the presence of powdered 4-Å molecular sieves, acting as acid sponge, interfered with the action of the heterogeneous promoter.
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2142766896
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It has to be noted that the assignment of the opposite configuration with respect to the ref 29d is due to the different substituent priorities.
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65
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2142718333
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note
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Compound -17b was prepared by selective debenzylation of the corresponding O-benzyl ester which was in turn obtained by the standard cyclocondensation reaction using benzyl acetoacetate, urea, and the aldehyde 5b (see the Experimental Section).
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2142703845
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The phenolic hydroxy group was protected in order to avoid possible transesterification reactions by the O-benzoyl groups.
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2142699596
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note
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Ambersep 900 OH was purchased from Fluka. This resin was washed with methanol and dried in vacuo before use.
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