Advances in Heterocyclic Chemistry, Vol. 18 by A.R. Katritzky, A.J. Boulton (Eds.)

By A.R. Katritzky, A.J. Boulton (Eds.)

(from preface)The current quantity features a wide variety of heterocyclic chemistry. Syntheses of heterocycles from thioureas are reviewed through T. S. Griffin, T. S. Woods, and I). L. Klayman, whereas eight. W. Schneller describes the chemistry of benzothiins and their derivatives (thiochromans. thiochromones, and thio-chromanones). advancements in chrom-3-ene chemistry are reviewed by means of L. Merlini. F. D. Popp contributes a bankruptcy at the isatins. A dialogue of theoretical facets of the tautomerism of pyrimidines, via J. S. Kwiatkowski and B. Pullman, follows up a corresponding past contribution (Vol. thirteen) on tautomeric purines. within the ultimate bankruptcy P. and D. Cagniant describe the typical prevalence ami synthesis of the bcnzofurans.

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A. Org. Khzna. 8 , 1791 (1971). 40‘1 A. H. Tomchin, Y. A . Kharit, and A. K. Kutscnko, K h m . Farm. Zh. 7, 10 (1973). 402 36 [Sec. C FRANK D. 407 The cyclization of certain 2-substituted isatin derivatives were studied so as to compare them with the above cyclizations. 408 In contrast t o (126) X = S (127) X = 0 (130) 405 (128) X = S (129) X = 0 (131) I. S. , A. B. Tomchin, and E. N. Zhultova, Zh. Obshch. Khim. 39, 2339 (1969). H. King and J . Wright, J . Chenz. , 2314 (1948). 407 IT. J. Lalor and .

I i t a . ,374 (1946). 1'.

M. Taha and M. A. Khatab, U . A . J . Chem. 13,227 (1970). 318 V. P. Arya, Swiss. Patent 491,100 (1970);Chem. Abstr. 73, 109673 (1970). 319 W. Seibert, Chem. Ber. 80, 494 (1947). 316 317 F. Sec. B] 29 THE CHEMISTRY O F ISATIN isoindigo, and 3 , 3 ' - b i o ~ i n d o l y 1 The . ~ ~ ~isoindigo probably arises from reaction of the oxindole and isatin while the bioxindolyl results from reduction of the isoindigo. Use of a stronger base, potassium t-biitoxide in dimethyl sulfoxide, gave only isatin a ~ i n e .

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