... 费雪酯化 fischer esterfication 分子内酯化 intramolecular esterification 高酯化果胶 high-eater ...
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Levetiracetam was prepared from L-methionine via reduction-dethiomethylation, esterification, ammonolysis, amidation and intramolecular cyclocondensation reaction with 44.6% overall yield.
以蛋氨酸为原料经还原脱硫甲基化、 酯化、 氨解、 酰胺化及分子内缩和成环4步反应合成得到了左乙拉西坦，总收率44.6%。
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