Advances in Heterocyclic Chemistry, Vol. 19 by A. R. & Boulton, A. J. [Eds]. Katritzky

By A. R. & Boulton, A. J. [Eds]. Katritzky

The current quantity comprises 4 chapters. the 1st (by Ollis and Ramsden) classifies and discusses the chemistry of that attention-grabbing crew of compounds often called meso-ionic heterocycles and features a beneficial basic definition of the time period. the second one bankruptcy (Litvinov and Gol'dfarb) bargains with platforms with (or extra) thiophene (or selenophene) jewelry without delay fused jointly. The 1,2,3-triazines, in addition to the better-known 1,2,3-benzotri-azines and different fused 1,2,3-triazine structures, are mentioned within the 3rd bankruptcy, by means of Kobylecki and McKillop. within the final bankruptcy George, Khetan, and Gupta deal with heterocyclic syntheses which contain the addition of nucleo-philic reagents to acetylenic esters.

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By A. R. & Boulton, A. J. [Eds]. Katritzky

The current quantity comprises 4 chapters. the 1st (by Ollis and Ramsden) classifies and discusses the chemistry of that attention-grabbing crew of compounds often called meso-ionic heterocycles and features a beneficial basic definition of the time period. the second one bankruptcy (Litvinov and Gol'dfarb) bargains with platforms with (or extra) thiophene (or selenophene) jewelry without delay fused jointly. The 1,2,3-triazines, in addition to the better-known 1,2,3-benzotri-azines and different fused 1,2,3-triazine structures, are mentioned within the 3rd bankruptcy, by means of Kobylecki and McKillop. within the final bankruptcy George, Khetan, and Gupta deal with heterocyclic syntheses which contain the addition of nucleo-philic reagents to acetylenic esters.

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Advances in Heterocyclic Chemistry, Vol. 19

The current quantity includes 4 chapters. the 1st (by Ollis and Ramsden) classifies and discusses the chemistry of that attention-grabbing crew of compounds often called meso-ionic heterocycles and contains a beneficial normal definition of the time period. the second one bankruptcy (Litvinov and Gol'dfarb) bargains with platforms with (or extra) thiophene (or selenophene) jewelry without delay fused jointly.

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Bayer, H. Gotthardt, and R. Huisgen, Chem. Ber. 103, 2356 (1970). m R. Huisgen, H. Gotthardt, and H. 0. Bayer, Chem. Ber. 103, 2368 (1970). 51(a) S. Mohan, B. Kumar,and J. S. Sandhu, Chem. Ind. T. Potts and J. Marshall, J. Chem. Chem. , loo0 (1972). L. Cobb and W. E. McEwen, J . Amer. Chem. 7 7 , 5042 (1955). 4g 20 W. I). OLLlS AND C. A. RAMSDEN [Sec. VILA tion of aldehydes from Reissert compounds. Sub~equently~~ this mesoionic intermediate was trapped using 1,3-dipolarophiles. 2-Benzoyl-1,2dihydroisoquinaldonitrile (8 1) and tetrafluoroboric acid gave the Reissert salt (82), which with dimethyl acetylenedicarboxylate gave the product 83, R1 = R2 = CO,Me, and with ethyl phenyl propiolate yielded the primary adduct (84) and a secondary product (83, R1= C0,Et; R2 = Ph).

A. RAMSDEN 34 [Sec. E 151, R1 = R2 = R3 = R4 = H, formed from 1-aminopyrid-2-one and carbonyl chloride. lo6The bicyclic diazetidine ester (152) and trifluoroacetic acid gave an isomeric a-pyridone, which yielded the bicyclic meso-ionic compound 15 1, R' = R4 = Me, R2 = R3 = Ph, on heating. 2. lo7*N-Methyl-N-benzoylhydrazine(147, R' = Me, R2 = Ph) and aryl isocyanide dichlorides (ArN=CC12) yield 1,3,4-0xadiazolium chlorides (154, R1 = Me, R2 = Ph, R3 = Ar),which with diazomethane give the meso-ionic 1,3,4-0xadiazol-2-imines(153) as yellow crystalline compounds.

Scund. 23, 2733 (1969); M. Begtrup and K. V. Poulsen, ibid. 25, 2087 (1971). IzaM. Begtrup, Actu Chem. Scund. 25, 249, 795, 803, 3500 (1971). IL9 I2O 40 [Sec. G W. D. OLLIS AND C. A. 12' They undergo 1,3-~ycloadditionreactions. 127 The meso-ionic compounds 176, R1= Me, R2=p-Me C,H,, R3= H,and dimethyl acetylenedicarboxylate give the pyrazole 186, whereas with diethyl azodicarboxylate the 1,3

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