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By E. S. H. El Ashry, Y. El Kilany, N. M. Nahas (auth.), El Sayed H. El Ashry (eds.)

This publication is a quantity within the sequence subject matters in Heterocyclic Chemistry.Itc- ers the major tools used for designing man made methods to heterocycles from carbohydrates and the price and scope of those equipment. Carbohydrates are generally disbursed in nature and represent the biggest a part of renewable biomasses. in addition, many carbohydrates and their derivatives are comm- cially on hand at fairly affordable costs. for that reason their usage is extremely inspired and economically they're of serious signi?cance. furthermore, carbohydrates are hugely functionalized compounds that may be without problems deri- tized and/or cyclized to supply heterocyclic compounds. This ebook presents a latest account and an updated description of the development within the synthesis of numerous heterocycles from carbohydrates. Carbohydrates should be regarded as a resource of chiral facilities as well as the variable modi?cation thereof. Herein the elaboration of the carbohydrate molecules for delivering varied heterocycles is the most target and group efforts from leaders of the themes has been accumulated during this quantity. This e-book is designed to be appropriate for college students and researchers. it's hugely urged as a reference e-book and for educating the attention-grabbing themes regarding carbohydrates, heterocycles and natural synthesis. as well as its significance in academia, it's also an outstanding resource for info in regards to the number of tools utilized in the synthesis of heterocycles vital to industry.

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3 Oxazines Dehydrative cyclization of the condensation product of 2,3,4,5-tetra-Oacetylgalactaroyl chloride with anthranilic acid gave 1,2,3,4-tetra-O-acetyl1,4-bis(4H-benzoxazin-4-one-2-yl)-galacto-tetritol 100 (X = O) (Fig. 17). Its Fig. 17 Pyrimidines and oxazines Manipulation of Carbohydrate Carbon Atoms for the Synthesis of Heterocycles 23 reaction with aniline in the presence of PCl3 afforded 1,4-bis(3-phenylquinazolin-4-one-2-yl)-1,2,3,4-tetra-O-acetyl-galacto-tetritol 101 (X = NPh) [156].

22. 23. 24. 25. 26. 27. 28. 29. El Ashry ESH, El Ashry Y (1976) Chem Ind (London) 372 El Ashry ESH, Rashed N (2000) Curr Org Chem 4:609 El Ashry ESH, El Kilany Y (1996) Adv Heterocycl Chem 67:391 El Ashry ESH, El Kilany Y (1997) Adv Heterocycl Chem 68:1 El Ashry ESH, El Kilany Y (1998) Adv Heterocycl Chem 69:129 El Ashry ESH, El Nemr A (2005) Synthesis of Naturally Occurring Nitrogen Heterocycles from Carbohydrates. Blackwell, Oxford, UK El Khadem H (1970) Adv Carbohydr Chem 25:351 El Ashry ESH, Awad LF, Atta AI (2006) Tetrahedron 62:2943 Svete J (2004) Monatsh Chem 135:629 Lichtenthaler FW (1991) Carbohydrates as Organic Raw Materials.

Fernández-Bolaños · Ó. López Scheme 26 N – N bond, was related to the high conformational strain of 109 [99]. No evidence of the configuration of the acetal carbons of the 1,4-dioxane ring was reported. 4 Synthesis of Triazoles Triazoles comprise an interesting family of heterocyclic compounds displaying important biological activities such as insecticidal [101], anticancer [102– 104], antiviral [104], HIV protease inhibitors [105] or antibacterial [106]. 1 Dimroth Reaction 8-Aza-3-deazaguanine nucleosides 113a–e have been prepared [107] from O-protected glycosyl azides 111a–e by a Dimroth reaction [108].

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