| Budget Amount *help |
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1988: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1987: ¥7,000,000 (Direct Cost: ¥7,000,000)
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| Research Abstract |
Polyfunctionalized pyridines are very important as materials having various functions or as synthetic reagents for such materials. Thus direct introduction of ethynyl group, which undergoes various types of reactions, to pyridines and their chemical transformations were studied.
It was found that a Reissert-Henze salt generated in-situ from pyridine N-oxide and benzoyl chloride reacted with a silver acetylide to afford 2-ethynyl-pyridine. The method is applicable to a variety of substituted acetylenes and substituted pyridines including quinoline and isoquinoline. Especially the method is advantageous when pyridines having a reactive substituent such as MeCO, MeOCO, CN and, hence, many hitherto unknown polyfunctionalized pyridines could be synthesized. Regioselectivity of the reaction was also discussed.
Chemical transformations of ethynylpyridines leading to bicyclic pyridines were successful. For example, heterocycles such as quinolinol, furopyridines, and pyrrolopyridine were synthesized from 3-substituted 2-ethynyl pyridines. Furthermore, new synthetic route to indolizine derivatives was found by treating ethynylpyridine with dimethyl acetylenedicarboxylate.
As results, various synthetic routes to polyfunctionalized pyiridine derivatives were developed by utilizing ethynylated pyridines.
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