
TY  - JOUR
A1  - Singh, H 
A1  - Singh, P 
A1  - Mehta, RK 
T1  - Synthesis of heterocyclics via enamines. VI. Acid-catalysed transformation of 4,6,6-Trimethyl-3,6-dihydropyrimidine-2-thiols. Functionalized cyclic enamines
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1978
VL  - 31
IS  - 10
SP  - 2307
EP  - 2312
KW  - 
UR  - https://doi.org/10.1071/CH9782307 
N2  - On heating with HCl or H2SO4, 4,6,6-trimethyl-3-phenyl-3,6- dihydropyrimidine-2-thiol (1; R = Ph) formed phenylthiourea and 4,6,6- trimethyl-2-phenylamino-6H-1,3-thiazine (3; R = Ph) and not 4,4,6- trimethyl-2-phenylamino-4H-1,3-thiazine (2; R = Ph) as reported by Ignatova. In a similar reaction, 4,6,6-trimethyl-3,6-dihydropyrimidine- 2-thiol gave thiourea, 2-amino-4,6,6-trimethyl-6H- 1,3-thiazine (3; R = H) and 4,6,6-trimethyl-4-(4',4',6'-trimethyl-1',4'-dihydropyrimidin-2'-ylthio)-tetrahydropyrimidine-2(1H)-thione (9). 
ER  -

