249750-75-2Relevant academic research and scientific papers
Stereoselective synthesis of (E)-halomethylidene[1,3]thiazolo[3,2-a] thieno[3,2-e] pyrimidinium and analogous [1,3]oxazolo[3,2-a] thieno[3,2-e]pyrimidinium halides starting from 3-N-substituted 2-propargylthio(oxy)thieno[2,3-d] pyrimidin-4-ones
Slivka, Marina,Krivovjaz, Andrej,Slivka, Mikhailo,Lendel, Vasil
, p. 189 - 193 (2013)
A convenient procedure for the stereoselective synthesis of [1,3]thiazolo[3,2-a]thieno[3,2-e]pyrimidinium halides and analogous [1,3]oxazolo[3,2-a] thieno[3,2-e]pyrimidinium halides 5 and 6 is reported. 2-Propargylthio-3-R-thieno[2,3-d]pyrimidin-4-ones and 2-propargyloxy-3-R- thieno[2,3-d]pyrimidin-4-ones were treated with bromine or iodine in AcOH to afford (E)-halomethylidene[1,3]thiazolo[3,2-a]thieno[3,2-e]pyrimidinium and (E)-halomethylidene-[1,3]oxazolo[3,2-a]thieno[3,2-e] pyrimidinium halides, respectively.
