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Table of Contents

Molecules, Volume 7, Issue 6 (June 2002), Pages 469-506

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	p. 469-474 Nuria Aguilar and Jochen Krüger Article: Toward a Library Synthesis of the Natural Dipeptide Antibiotic TAN 1057 A,B Molecules 2002, 7(6), 469-474; doi:10.3390/70600469 Received: 2 May 2002; in revised form: 10 June 2002 / Accepted: 14 June 2002 / Published: 30 June 2002 Show/Hide Abstract | Download PDF Full-text (33 KB) Abstract: The natural dipeptide antibiotic TAN 1057 A,B represents a promising new antibiotic entity. In this communication we report a novel approach for the synthesis of TAN 1057 A,B analogs bearing variations in the β-arginine side chain. This approach involves a combination of liquid and solid phase methods and allows for a library synthesis of analogs of the natural product.
	p. 475-486 Mauricio Gomes Constantino, Altamiro Xavier De Souza and Gil Valdo José Da Silva Article: Synthetic Studies on Diels-Alder Adducts: Intramolecular Interactions Between Two Functions Molecules 2002, 7(6), 475-486; doi:10.3390/70600475 Received: 17 August 2001; in revised form: 28 June 2002 / Accepted: 28 June 2002 / Published: 30 June 2002 Show/Hide Abstract | Download PDF Full-text (87 KB) Abstract: In this paper we describe the synthesis of a γ,δ-unsaturated aldehyde from a bicyclic Diels-Alder adduct, to be used in future electrocyclic reaction studies. A number of reactions produced undesired materials resulting from the interaction between functions, forcing the use of partial protection to accomplish a synthesis that would be otherwise straightforward. Suggestions to account for the results are given.
	p. 487-493 S. Thennarasu and P. T. Perumal Article: An Efficient Preparation of 1,2-Diamino-1-phenylheptane Molecules 2002, 7(6), 487-493; doi:10.3390/70600487 Received: 12 December 2001; in revised form: 24 June 2002 / Accepted: 25 June 2002 / Published: 30 June 2002 Show/Hide Abstract | Download PDF Full-text (50 KB) Abstract: A convenient four-step method for the preparation of the lipophilic vicinal diamine 1,2-diamino-1-phenylheptane is described. Condensation involving octan-2-one, benzaldehyde and ammonia is reported. Regioselective Schmidt rearrangement of 2,6-diphenyl-3-pentyl-piperidin-4-one (1) to 2,7-diphenyl-3-pentyl hexahydrodiazapin-5-one (3) is presented. Hydrolysis of 2,7-diphenyl-3-pentyl hexahydrodiazapin-5-one to 1,2-diamino-1-phenylheptane (4) is also reported for the first time.
	p. 494-500 Tayseer A. Abdallah, Manal A. Darwish and Hamdi M. Hassaneen Article: A Novel Synthesis of 1,2,4-Triazolopteridines Molecules 2002, 7(6), 494-500; doi:10.3390/70600494 Received: 19 March 2002; in revised form: 9 June 2002 / Accepted: 12 June 2002 / Published: 30 June 2002 Show/Hide Abstract | Download PDF Full-text (117 KB) Abstract: Reaction of 1,2-dihydro-2-thioxopteridin-4(3H)-one, 6,7-dimethyl-1,2-dihydro-2-thioxopteridin-4(3H)-one and 6,7-diphenyl-1,2-dihydro-2-thioxopteridin-4(3H)-one with hydrazonoyl halides affords the title compounds in good yields.
	p. 501-506 Omayma A. Eldahshan, Nahla A. Ayoub, Abd-El Naser B. Singab and Mohamed M. El-Azizi Article: Carotamine, a Unique Aromatic Amide from Daucus Carota L. Var Biossieri (Apiaceae) Molecules 2002, 7(6), 501-506; doi:10.3390/70600501 Received: 11 May 2002; in revised form: 24 June 2002 / Accepted: 26 June 2002 / Published: 30 June 2002 Show/Hide Abstract | Download PDF Full-text (34 KB) Abstract: The unique aromatic peptide 4-(p-aminobenzoylamino)-2-aminobenzoic acid, carotamine, together with 2,4-diaminobenzoic acid, isolated for the first time from a plant source, were identified from the aqueous alcoholic extract of the aerial parts of Daucus carota L. var. boissieri (Apiaceae). The structures were determined through conventional methods of analysis and confirmed by LC-ESI/MS and NMR spectral analysis.
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