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Abstract
A number of 1-alkyl-4-prop-2-ynylthioquinolin-2(1 H)-one derivatives are synthesised by the phase transfer catalyzed reaction of 1-alkyl-4-marcaptoquinolin-2(1 H)-ones with different prop-2-ynylic halides. These are then regioselectively cyclised in refluxing chlorobenzene to give hitherto unreported 2 H-thiopyrano[3,2- c]quinolin-5(6 H)-ones in 85–90% isolable yields.
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