1)ссылки на статью нет, известны следующие данные:
J. Heterocycl. Chem 1996, Volume 33, pp. 1859-1863
A New Method for the Synthesis of 4H-1,3,4-Thiadiazino[5,6-b]quinoxalines
Yoshihisa Kurasawa [a], Masae Sekine [a], Ho Sik Kim , Yoshihisa Okamoto [c]
The reaction of 6-chloro-2-[1-methyl-2-(N-methylthiocarbamoyl)hydrazino]quinoxaline 4-oxide 5 with acetic anhydride or trifluoroacetic anhydride resulted in dehydrative cyclization to give 2-(N-acetyl)methylamino-8-chloro-4-methyl-4H-1,3,4-thiadiazino[5,6-b]quinoxaline 6 or 8-chloro-2-(N-trifluoroacetyl)methylamino-4-methyl-4H-1,3,4-thiadiazino[5,6-b]quinoxaline 9, respectively. The oxidation of compound 6 or 9 with 2-fold molar amount of m-chloroperbenzoic acid afforded the 4H-1,3,4-thiadiazino[5,6-b]quinoxaline 1,1-dioxide 8 or 13, respectively. The acetyl group of compound 6 was hardly hydrolyzed, but the trifluoroacetyl group of compound 9 was easily hydrolyzed to change into 8-chloro-4-methyl-2-methylamino-4H-1,3,4-thiadiazino[5,6-b]quinoxaline 10. The acylation of compound 10 with acetic anhydride trifluoroacetic anhydride, phenyl isocyanate, and chloroacetyl chloride furnished the 2-(N-acetyl)methylamino 6, 2-(N-trifluoroacetyl)methylamino 9, 2-(1-methyl-3-phenylureido) 11, and 2-(N-chloroacetyl)methylamino 12 derivatives, respectively.
2)
Helvetica Chimica Acta
Volume 75, Issue 3 , Pages 907 - 912
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http://dx.doi.org/10.1002/hlca.19920750325Chemische Verfahrens-Forschung und-Entwicklung der Sandoz Pharma AG, Lichtstrasse 35, CH-4002 Basel
Translated Abstract
Synthesis of 2-Substituted and 2,3-Disubstituted Alkyl- und Aryl-thiophenes and Related 2,3-Anellated Thiophene Derivatives, Using Ketones and Carbonodithioic Acid O-Ethyl S-(2-Oxoethyl) Ester as the Building BlocksA simple method to synthesize 2-substituted and 2,3-disubstituted alkyl- and aryl-thiophenes as well as related 2,3-anellated thiophenes 6, starting from ketones 1 as C2-fragment and the S-protected carbonodithionic-acid derivative 3 as a C2S-fragment is described. The aldols 4 are intermediates of the two step process.
3)
Monatshefte für Chemie / Chemical Monthly
Organische Chemie Und Biochemie
Volume 117, Number 5 / 1986 621-629
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http://dx.doi.org/10.1007/BF00817900Abstract A simple method for the synthesis of fused thiophenes by reaction of agr-carboxymethyl substituted cyclic ketones withLawesson-reagent is described. Considerations concerning the reaction mechanism are given.
4)
Journal of Organometallic Chemistry
Volume 613, Issue 2, 3 November 2000, Pages 231-235
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http://dx.doi.org/10.1016/S0022-328X(00)00535-0Wen-Shu HwangCorresponding, Dong-Liang Wangb and Michael Y. Chiang
Abstract
Cyclometalated hexacarbonyldiiron complex 2, which derived from N-(2-thienylmethylidene)aniline, undergoes (1) thermolysis to recover the original Schiff base 1, (2) reduction to form a hydrogenation product of the original thienyl Schiff base 3, (3) substitution to form a phosphine-substituted complex 4, and (4) chemical as well as electrochemical oxidation to produce a γ-lactam 5.
