Studies on bisthiazolo[3,2-a:4′,5′-d]pyrimidine derivatives. Part II
作者:Amrik Singh、Harjit Singh、C. K. Dewan、K. S. Narang
DOI:10.1039/j39700001114
日期:——
7-dihydro-6-methylbisthiazolo[3,2-a:4′,5′-d]pyrimidine-2(3H),9-diones (IX) when heated in polyphosphoric acid. Treatment of compounds (V) with bromine, followed by dehydrobromination, gave ethyl 3-aryl-4-(5-bromomethylthiazolidin-2-ylideneamino)-2-imino-4-thiazoline-5-carboxylates (XI), which were cyclised to 9H-3-aryl-6-bromomethyl-6,7-dihydrobisthiazolo[3,2-a:4′,5′-d]pyrimidine-2(3H),9-diones (XII)
通过4-氨基-3-芳基-2-亚氨基-2-亚氨基-4-噻唑啉-5-羧酸乙酯的缩合反应制得的乙基4-烯丙基硫脲基-3-芳基-2-亚氨基-4-噻唑啉-5-羧酸酯(I) )与异硫氰酸烯丙酯一起,转化为9 H -3-芳基-6,7-二氢-6-甲基双噻唑并[3,2- a:4',5'- d ]嘧啶-2(3 H),9-二酮(IX)在多磷酸中加热时。用溴处理化合物(V),然后进行脱氢溴化,得到乙基3-芳基-4-(5-溴甲基噻唑烷二-2-亚甲基氨基)-2-亚氨基-4-噻唑啉-5-羧酸乙酯(XI),将其环化为9 H -3-芳基-6-溴甲基-6,7-二氢双噻唑并[3,2- a:4',5'- d ]嘧啶-2(3 H),9-二酮(XII)。