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Abstract This thesis includes three chapters; the first of which is a brief review on the recent methods utilized for the synthesis of” various heterocycles condensed with the 1, 2, 4- triazine ring. Chapter II is a discussion of the work carried out by the candidate. It deals with the versatility and regio- selectivity of the annelation of a triazole ring to 1,2,4- triazino[5,6-b]indoles and it was divided according to the type of substituent on the triazinoindole ring. Thus, 3- hYdrazino-5-methyl-1,2,4-triazino[5,6-b]indole I was pre- pared and its reaction with acetaldehyde was carried out hereby acetaldehyde(5-methyl-l.2,4-triazino[5,6-b]indol-3- y1)hydrazone II was formed. Similarly, a series of the hydrazones III were prepared by the condensation of I with onosaccharides, such as Q.-galactose, Q.-glucose, Q.-mannose, <g-arabinose, L-arabinose, D-ribose and Q.-xylose. |