Enoate Reductase-Mediated Preparation of Methyl (S)-2-Bromobutanoate, a Useful Key Intermediate for the Synthesis of Chiral Active Pharmaceutical Ingredients
摘要:
Enoate reductases belonging to the Old Yellow Enzyme (OYE) family were employed to develop a biocatalysed approach to methyl (S)-2-bromobutanoate, a key intermediate for the introduction of a particular stereogenic unit into the molecular skeleton of a certain class of chiral drugs. Methyl (Z)-2-bromocrotonate afforded, respectively, (S)-2-bromobutanoic acid (ee = 97%) and methyl (S)-2-bromobutanoate (ee = 97%) by baker's yeast fermentation and by OYE1-3 biotransformations. The bioreductions of other methyl 2-haloalkenoates were also considered. It was observed that the (Z)- and (E)-diastereoisomers of alpha-bromo unsaturated esters afforded the same enantiomer of the corresponding reduced product.
The direct organocatalytic enantioselective α-chlorination of aldehydes has been developed. The reaction proceeds for a series of different aldehydes with NCS as the chlorine source using easily available catalysts such as l-proline amide and (2R,5R)-diphenylpyrrolidine. The α-chloro aldehydes are obtained in up to 99% yield and up to 95% ee. The synthetic utility of the enantioselective α-chlorination
the bacterial lipase exhibited high catalytic activity for hydrolysis and stereoselectivity toward racemic methyl 2-chlorobutanoate. When the enzymatic reaction was carried out in 6% of racemic substrate, the enantiomeric excess (e.e.s) reached more than 95%, with a yield of over 86%. Therefore, this lipase can efficiently resolve racemic methyl 2-chlorobutanoate and obtain (S)-methyl 2-chlorobutanoate
癫痫是一种由脑神经元突然异常放电引起的慢性疾病,导致短暂的脑功能障碍。比利时UCB公司研制的左乙拉西坦是治疗癫痫的有效药物。( S )-2-氯丁酸甲酯是左乙拉西坦的重要手性结构单元,引起了广泛关注。在这项研究中,一株脂肪酶产生的不动杆菌属。zjutfet-1 是从土壤样品中筛选出来的。在优化的发酵和生物催化条件下,细菌脂肪酶表现出高的水解催化活性和对消旋2-氯丁酸甲酯的立体选择性。当酶促反应在 6% 的外消旋底物中进行时,对映体过量 ( e .e . s ) 达到95%以上,收率86%以上。因此,该脂肪酶可高效分解外消旋的2-氯丁酸甲酯,得到( S )-2-氯丁酸甲酯,在左乙拉西坦的工业化生产中具有很大的应用潜力。
WO2006/90768
申请人:——
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公开(公告)日:——
Freudenberg; Lwowski, Justus Liebigs Annalen der Chemie, 1955, vol. 597, p. 141,145
作者:Freudenberg、Lwowski
DOI:——
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