Read e-book online Advances in Heterocyclic Chemistry, Vol. 49 PDF

By Alan R. Katritzky (Ed.)

ISBN-10: 0120206498

ISBN-13: 9780120206490

(from preface)Volume forty nine of Advances in Heterocyclic Chemistry comprises 5 chapters. Professors M. Tiller and B. Stanovnik of the college of Ljubljana, Yugoslavia hide the development in pyridazine chemistry considering 1979, the date in their prior e-book in quantity 24 of Advances.Professor Vorbruggen of Berlin has contributed a survey of the amination of nitrogen heterocycles, which offers rather with aminations within which an ami no team replaces another performance at the heterocyclic ring. hence, this evaluation enhances our fresh overview in quantity forty four facing the Tschitschibabin response, within which a hydrogen atom at the heterocyclic ring is changed through an amino group.The different 3 chapters within the current quantity all care for bicyclic heterocycles. Dr. H. ok. Pujari of Kurukshetra college in India describes condensed 4-thiazolidinones, and Professor M. A. E. Shaban and A. Z. Nasr of Alexandria collage in Egypt survey the synthesis of condensed 1,2,4-triazolo heterocycles. eventually, Professor T. A. Crabb of Portsmouth, England has lined saturated bicyclic 6/5 ring-fused structures with a bridgehead nitrogen and a unmarried extra heteroatom. None of those teams of bicyclic heterocycles has been comprehensively reviewed sooner than.

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Moreover, structures of thiones 213,219,222, 225,228 and 231 used as the starting materials are not established beyond doubt. 26. 4-h:3'. 2'-6]-s-triazol-3(2~)-ones (235)(85JIC 147)(Scheme 57). Compounds 235 in general were found to be more potent herbicides than their precursors, 234, suggesting that 235 must be compact and possess planar structure. ClCH$O2Et r v RCHO 0 0 H (231) (2 32) SCHEME 56 ( 233) 40 HRUSHl K . PUJARI [Sec. Me R:alkyl,aryl SCHEME 57 This conforms with earlier observations that compact size and planarity of a molecule often enhance its herbicidal activities [56N(L)1042; 63MIl; 76T6151.

This method gives good results in all condensed thiazolidinones synthesized in the author’s laboratory and provides an easy and reliable method of distinguishing both isomers (see Section 111). The structural assignment for 290 and 291 was also arrived at by comparing the chemical shifts of aromatic protons HAand Hu of 290g and 291g with those of 289g In structure 290g Hu is shifted downfield. while HAin 291g is shifted downfield compared to the corresponding protons of the acid 289g. Structure 290a also was confirmed directly from the most downfield signal due to H B which showed meta coupling.

L I . A structure of 23 was confirmed by X-ray crystallography as well as by independent synthesis from 247 and maleic anhydride in glyme followed by sequential treatment of 272a with diazomethane in THF and bromine in acetic acid. Six-membered thiazinone structure 24 was tentatively suggested on the basis of 'H-NMRspectroscopy for the second cyclized product, which they were unable to isolate cleanly. Much insight came from the work of Wade (79JOC1816), who studied the reaction of 247 with DMAD under different conditions and characterized the products.

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Advances in Heterocyclic Chemistry, Vol. 49 by Alan R. Katritzky (Ed.)

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