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The recently reported synthesis 4-arylsulfonyl-6-oxopiperazine-2- carboxylic acids included six linear steps: Nishida, H.; Mukaihira, T.; Saitoh, F.; Harada, K.; Fukui, M.; Matsusue, T.; Okamoto, A.; Hasaka, Y.; Matsumoto, M.; Shiromozu, I.; Ohnishi, S.; Mochizuki, H. Chem. Pharm. Bull. 2004, 52, 406-412, 459-462.
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21
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20044373669
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note
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The final 5-carbamoyl-4-sulfonyl-2-piperazinones 4 were prepared according to the following general procedure: A solution of an N-sulfonyl-N-(2-oxopropyl)glycine 1 (1 mmol), a primary aromatic or aliphatic amine 2 (1 mmol), and an isonitrile 3 (1 mmol) in anhydrous methanol (3-5 mL) was stirred at room temperature for 8 h. The precipitate formed was separated by filtration; washed with a small amount of cold methanol, followed by ether; and air-dried (in the cases when the product did not precipitate from the reaction mixture, the solvent was removed in vacuo, and the residue was then solidified upon addition of a small amount of ether prior to filtration). The yield of the obtained solid products was 45-75% with at least 95% purity, as demonstrated by LC/MS analysis.
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20044393846
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The keto acids 1 used in this study are commercially available from ChemDiv. Inc. (http://www.chemdiv.com).
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20044364976
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note
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1H NMR spectroscopy.
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20044392685
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note
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Our preliminary results on similar multicomponent reactions involving ketocarboxylic acids derived from α-amino acids other than glycine indicated that such processes provide the desired products as mixtures of diastereomers. Because the latter were found difficult to separate, a possibility of attaining some degree of diastereocontol is being currently investigated.
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