Regioselective synthesis of substituted thieno[2,3-b]pyrimidines and pyrido[3′,2′:4,5]thienopyrimidines and their [3,2-d]selenopheno analogs from 3-cyanopyridine-2(1H)-thiones, 3-cyano-pyridine-2(1H)-selenones,and N-cyanochloracetamidine |
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收稿时间: | 22 October 1993 |
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