对映选择合成
纤维素
基质(化学分析)
化学
有机化学
化学工程
高分子科学
色谱法
催化作用
工程类
作者
Michel Chaves,Paulo J. S. Moran,J. Augusto R. Rodrigues
出处
期刊:Journal of Molecular Catalysis B-enzymatic
[Elsevier]
日期:2013-12-01
卷期号:98: 73-77
被引量:7
标识
DOI:10.1016/j.molcatb.2013.09.018
摘要
Abstract Methyleneketoesters were prepared in >90% yield by performing an IBX oxidation of Morita–Baylis–Hillman adducts. A methodology was developed to achieve methyl 3-aryl-3-keto-2-methylenepropanoate reduction using a screening of yeast strains in three different reaction procedures to obtain products with both high yield and diastereoselectivity. The reactions conducted in water provided inferior yields (50%) for substrates 2b–c. Employing Amberlite® XAD7HP which was a substrate reservoir that also immediately extracted the products from the reaction medium after their formation, syn-4a–c and anti-4a–c were isolated in 60–70% yield, with high stereoselectivity (98–99% ee). The best results were obtained using substrates adsorbed on filter paper which provided products yields above 70%, a 99% ee and a diastereomoeric ratio (syn-4: anti-4) 9:1. Cellulose matrix has excellent potential to be successfully employed in general biocatalytic reactions.
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