been reported in the literature.1,3 Herein, we report an efficient one-pot synthetic approach to the synthesis of new 4-(1-(pyrimidin-4-yl)ethyl)-12H-pyrimido[4\\\\\\',5\\\\\\':5,6][1,4]thiazino[2,3-b]quinoxaline derivatives from 5-bromo-4-[1-(5-bromo...

to the synthesis of various

derivatives of pyrazolo[5\\'\\',1\\'\\':2\\',3\\']pyrimido[4\\',5\\':5,6][1,4]thiazino[2,3-b]quinoxaline as a

novel heterocyclic system. These potential pharmacologically active and fluorescent derivatives

(3a...

A convenient and efficient procedure for the synthesis of tetracyclic dithiepin derivatives is described

through the condensation reaction of 2,4-dichloro-5-(chloromethyl)-6- methylpyrimidine and quinoxaline-
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