Citation:
Dao-Lin Wang, Dong Wang, Liang Yan, Guang-Yu Pan, Jian-Nan Yang. An efficient synthesis of novel pyridothieno-fused thiazolo[3,2-a]pyrimidinones via Pictet–Spengler reaction[J]. Chinese Chemical Letters,
;2016, 27(6): 953-956.
doi:
10.1016/j.cclet.2016.02.007
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An efficient method for the synthesis of novel pyrido[3'',2'':4',5']thieno[3',2':2,3]pyrido [4,5:d][1,3]thiazolo[3,2-a]pyrimidine-4-one derivatives (5) has been developed using a Pictet-Spengler reaction between 2-(3-aminothieno[2,3-b]pyridin-2-yl)thiazolo[3,2-a] pyrimidin-5-one (3), which could be obtained from the condensation of 7-(chloromethyl)-5H-thiazolo[3,2-a]pyrimidin-5-one (1) with 3-cyanopyridine-2-thione (2) via Thorpe-Ziegler isomerization, and aromatic aldehydes under NH2SO3H as catalysis in good yields.
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