- Stability investigations of alkyl 2,4-bisaryl-6-methyl-1,2,3,4- tetrahydropyrimidine-5-carboxylates
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The tetrahydropyrimidines (THPM) with an 4-(2-nitrophenyl) substituent 14 react with UV-A-light to yield the pyrimido[1,6-b]indazoles 16 and the cyclic hydroxamic acid 20 as a by-product. Irradiation of the 2,4-bis(2- nitrophenyl) THMP 2 do not give the 2,4-bis(2-nitrosophenyl)pyrimidine 26, but a mixture of the pyrimido[1,6-b]- and -[1,2-b]-indazoles 27 and 28. The products obtained by oxidation and reduction of the THPM are reported including the synthesis of pyrido[5,4-b]quinolines.
- Goerlitzer,Heinrici
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p. 847 - 853
(2007/10/03)
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- Synthesis of Dimethyl and Diethyl 2-Aryl-4,6-dimethyl-1,2-dihydropyridine-3,5-dicarboxylates - Isomers of Hantzsch-type 1,4-Dihydropyridines.
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Dimethyl and diethyl 2-aryl-4,6-dimethyl-1,2-dihydropyridine-3,5-dicarboxylates are produced from the reaction of aldehydes with ketoesters, when a large excess of ammonia is added to the components in acetic acid solution.
- O'Callaghan, Conor N.
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p. 2901 - 2915
(2007/10/02)
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