Advances in Heterocyclic Chemistry, Vol. 41 by Alan R. Katritzky (Ed.) PDF

By Alan R. Katritzky (Ed.)

ISBN-10: 0120206412

ISBN-13: 9780120206414

(from preface)In the 1st bankruptcy, D. S. Donald and O. W. Webster summarize a lot basic heterocyclic chemistry facing the guidance of heterocycles from hydrogen cyanide and its derivatives, as a rule formerly on hand merely within the patent literature. within the moment, the account of the ring-opening of 5-membered heteroaromatic anions through T. L. Gilchrist brings jointly the various variations that may be triumphant the removing of a proton from a carbon atom in a 5-membered heterocyclic ring.A crew of Italian staff from Modena, led via Professor Taddei, has reviewed released paintings at the conformations of acyl teams in heterocyclic compounds, together with either C-acyl and N-acyl derivatives. the 1st fresh evaluation of the basicity and acidity of azoles, protecting either gas-phase and answer measurements, is gifted through a gaggle of Spanish employees (Catalan et aL). H. Weber has summarized the huge contemporary development in oxidative modifications of heteroaromatic iminium salts.Finally, a bunch of Egyptian staff led by way of Professor Elnagdi has lined the pyrazolopyrimidines, ring structures receiving expanding curiosity, yet by no means formerly reviewed.The options that have been pointed out within the preface to quantity forty of the sequence were good got, specifically, the recent approach used for the references and the preparations for the indexing. As indicated within the preface to quantity forty, the subsequent index quantity should be quantity forty five.

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Polym. Sci. 12, 633 (1974). 0. W. Webster, U. S. Pat. 3,793,339 (1974) [not abstracted by CAI. W. Webster, U. S. Pat. 3,801,585 (1974) [CA 78, 159611 (1973)l. D. S. Donald, U. S. Pat. 3,808,209 (1974) [CA 83,81219 (1975)l. D. S. Donald, U. S. Pat. 3814757 (1974) [CA 78, 30463 (1973)l. R. W. Begland, U. S. Pat. 3,849,479 (1974) [CA 82,87161 (1975)l. H. W. Rothkopf, D. Wohrle, R. Miiller, and G. Kossmehl, Chem. Ber. 108,875 (1975). D. S. James, Ger. Pat. , 2,514,581 [CA 84, 19172 (1976)l. B. A. Carlson, W.

DAMN + '1:- R X = OR, SR, NR,, OH H NC (128) SCHEME46 4. Pyrazines from Mono- and Bis-Schifl Bases of DAMN The mono-Schiff bases of DAMN and acyl cyanides can lead to either hydrox ydicyanopyrazines 128 (80JAP(K)80- 167276), aminodicyanopyrazines 129 (76JOC629),or aminocarbamoylcyanopyrazines 130 (79JOC827), depending upon the reaction conditions (Scheme 47). D. S. DONALD AND 0. W. WEBSTER 32 [Sec. A In an attempt to prepare unsymmetrical bis-Schiff bases of DAMN under conditions mild enough to prevent exchange, Ohtsuka found that the unexpected, concomitant hydrolysis of the nitrile adjacent to the reaction site gave the bis-Schiff bases 131, which underwent a facile diaza Cope rearrangement giving dihydropyrazines in moderate yields, usually as mixtures of 132 and 133 (79JOC4871)(Scheme 48).

Biol. 38, 121 (1968). Y. Yamada, N. Nagashima, Y. Iwashito, A. Nakamura, and I. Kumashiro, Tetrahedron Lett.. 4529 (1968). S. S. Hirsch, J. Polym. , Part A-I 7, 15(1969). W. J. Middleton and D. Metzger, J. Org. Chem. 35,3985 (1970). E. Ciganek, W. J. Linn, and 0. W. Webster, in “Cyanocarbon and Polycyano Compounds in Chemistry of the Cyano Group’’ (Z. ), pp. 423-638. Wiley (Interscience), New York, 1970. D. S. Donald, unpublished results (1970). R. W. Begland, A. Cairncross, D. S. Donald, D. R.

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