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Base-Catalyzed Highly Stereoselective Conversion of g-Hydroxy-a,bacetylenic Esters to g-Acetoxy Dienoates

机译:碱催化的g-羟基-a,b炔基酯的立体选择性高转化为g-乙酰氧基二烯酸酯

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摘要

g-Hydroxy-a,b-acetylenic esters can be conveniently prepared from the reaction of methyl propiolate with aldehydes in the presence of ZnEt2 and Nmethylimidazole at room temperature. It is discovered that the g-hydroxy-a,b-acetylenic esters can be catalyzed by p-N,N-dimethylaminopyridine (DMAP) in acetic anhydride to generate the g-acetoxy dienoates with high stereo control. The mechanism of this conversion is investigated by NMR ananlyses and isotope labeling experiments. An intramolecular Diels–Alder reaction of a g-acetoxy dienoate is conducted to show the synthetic potential of these compounds.
机译:在室温下,在ZnEt2和N-甲基咪唑存在下,由丙酸甲酯与醛反应可方便地制得g-羟基-a,b-炔属酯。发现g-羟基-a,b-炔属酯可被乙酸酐中的对-N,N-二甲基氨基吡啶(DMAP)催化,生成立体控制度高的g-乙酰氧基二烯酸酯。通过NMR分析和同位素标记实验研究了这种转化的机理。进行了g-乙酰氧基二烯酸酯的分子内Diels-Alder反应,以显示这些化合物的合成潜力。

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