62432-97-7Relevant articles and documents
Zigeuner,Schweiger
, p. 1361,1363, 1366 (1976)
4-Hydroxy-6,6-dimethyl-5,6-dihydro-2(1H)-pyridinethione and -one and the Corresponding Tautomers
Zigeuner, Gustav,Schweiger, Klaus,Fuchsgruber, Alfred
, p. 187 - 198 (2007/10/02)
The tautomers, 4-hydroxy-5,6-dihydro-6,6-dimethyl-2(1H)-pyridinethione (1) and 6,6-dimethyl-2-thioxo-4-piperidone (2) resp., and 4-hydroxy-5,6-dihydro-6,6-dimethyl-2(1H)-pyridone (9) and 6,6-dimethyl-2,4-piperidinedione (10) resp. were synthesized by hydrolysis of 4-amino-5,6-dihydro-6,6-dimethyl-2(1H)-pyridinethiones (4,5) and -ones (11,12). 1,2 and 9,10 undergo an aminolysis in amines to the corresponding 4-aminodihydro-2(1H)-pyridinethiones 4,5 and -ones 11, 12 resp. - Keywords: 6,6-Dimethyl-2,4-piperidindione; 6,6-Dimethyl-2-thioxo-4-piperidone; 4-Hydroxy-6,6-dimethyl-5,6-dihydro-2(1H)-pyridone, and -pyridinethione; Keto-enol-tautomeris m
Synthesis of Heterocyclic Compounds via Enamines. Part 8. Acid-catalysed Transformations in 4,4,6-Trimethyl-1,4-Dihydropyrimidine-2(3H)-thione Derivatives and Related Compounds
Singh, Harjit,Singh, Paramjit
, p. 1013 - 1018 (2007/10/02)
1-Substituted 4,4,6-trimethyl-1,4-dihydropyrimidine-2(3H)-thiones (2) on heating in 11M-HCl at 100-110 deg C are converted into the corresponding 2-substituted-amino-4,6,6-trimethyl-6H-1,3-thiazines (4) and/or thioureas.But at 95-100 deg C, Dimroth rearrangement products, e.g. the corresponding 2-substituted-amino-4,4,6-trimethyl-4H-1,3-thiazenes (3) are formed.