Enantioselective Chemoenzymatic Synthesis of the S-Enantiomer of the Systemic Fungicide Fenpropimorph
作者:Amir Avdagić、Mirjana Gelo-Pujić、Vitomir Šunjić
DOI:10.1055/s-1995-4107
日期:1995.11
Chemoenzymatic synthesis of the S-(-)-enantiomer of fenpropimorph (S)-1 in high optical and chemical purity is described. One feature of this process entails the enantioselective acetylation of prochiral 1,3-propanediol 4 by Pseudomonas sp. lipases, and subsequent transformation of the monoacetate (R)-5 into the final product by the selected order of transformations that comprise; chlorination or tosylation under non-racemizing conditions, hydrogenolysis of the resulting chloromethyl or tosyl group in (+)-6 and (+)-8, second chlorination of (-)-9, and alkylation of cis-3,5-dimethylmorpholine by 1-chloropropane derivative (+)-10. This sequence of reactions affords (S)-1, the more active enantiomer in the commercialized racemic mixture with systemic fungicidal activity.
本研究介绍了高光学纯度和化学纯度的芬普吗啉(S)-1 的 S-(-)-对映体的化学合成。该工艺的一个特点是通过假单胞菌(Pseudomonas sp.该工艺的特点之一是利用假单胞菌脂肪酶对 1,3-丙二醇 4 的手性进行对映体选择性乙酰化,然后通过选定的转化顺序将单乙酸酯 (R)-5 转化为最终产品,这些转化顺序包括:在非梯度化条件下进行氯化或甲苯磺酰化反应,对 (+)-6 和 (+)-8 中产生的氯甲基或甲苯磺酰基进行氢解反应,对 (-)-9 进行第二次氯化反应,以及用 1-氯丙烷衍生物 (+)-10 对顺式-3,5-二甲基吗啉进行烷基化反应。通过这一系列反应,可得到(S)-1,它是商品化外消旋混合物中活性更强的对映体,具有系统杀菌活性。