Thiazine Derivatives Research Articles

Thiazine derivatives. 3. The synthesis of some 2-substituted 5,6-dihydro-1,3(4H)-thiazines and tetrahydro-1,3-thiazines related to cephams.

Thiazine derivatives. 3. The synthesis of some 2-substituted 5,6-dihydro-1,3(4H)-thiazines and tetrahydro-1,3-thiazines related to cephams.

Synthesis of pyrimido[4, 5-b][1, 4]thiazine derivatives

Synthesis of pyrimido[4, 5-b][1, 4]thiazine derivatives

Syntheses of Thiazolo-[5, 4-d]pyrimidine Derivatives and Related Compounds.

Heating of the sodium salt of 4-amino-5-acylamino-6-mercaptopyrimidine results in the formation of a purine derivative but its heating with dilute hydrochloric or sulfuric acid was found to give thiazolo[5, 4-d]pyrimidine derivatives. 5-Amino-6-mercaptopyrimidine derivatives react with nitrile to form thiazolo[5, 4-d]pyrimidine derivatives, while they react with monochloroacetic acid to form pyrimido[4, 5-b][1, 4]thiazine derivatives, and with nitrous acid to form thiadiazolo[5, 4-d]pyrimidine derivatives.