Large-Scale Synthesis of New Pyranoid Building Blocks Based on Aldolase-Catalysed Carbon-Carbon Bond Formation
作者:Michael Wolberg、Ben H. N. Dassen、Martin Schürmann、Stefan Jennewein、Marcel G. Wubbolts、Hans E. Schoemaker、Daniel Mink
DOI:10.1002/adsc.200800224
日期:2008.8.4
A newlarge-scale approach to the synthetically versatile chloromethyl-substituted, α,β-unsaturated δ-lactone 3 is described. The synthesis is based on a biocatalytic process performed on an industrial scale. Conjugate addition of C-, N-, O-, and S-nucleophiles to lactone 3 affords a variety of newpyranoidbuildingblocks in a highly diastereoselective manner. The operational simplicity of the whole
Efficient synthesis of (3R,5S)-6-chloro-2,4,6-trideoxyhexapyranose by using new 2-deoxy-d-ribose-5-phosphate aldolase from Streptococcus suis with moderate activity and aldehyde tolerance
for 2 h. The enzyme showed moderate activity and aldehyde tolerance compared with reported DERAs. The SsDERA-catalyzed reaction between 200 mM acetaldehyde and 100 mM chloroacetaldehyde generated (3R,5S)-6-chloro-2,4,6-trideoxyhexapyranose in 76 % yield in 8 h. This work provides a new DERA for the synthesis of (3R,5S)-6-chloro-2,4,6-trideoxyhexapyranose, which is a potential candidate for the industrial
摘要 2-脱氧-d-核糖-5-磷酸醛缩酶(DERA)是合成他汀类药物侧链中间体的有用工具。在这项工作中,我们通过结构和序列比对鉴定了来自猪链球菌 (SsDERA) 的 DERA,并在大肠杆菌 BL21 中高度表达。重组SsDERA在最佳条件下对2-脱氧-d-核糖-5-磷酸的比活性为18.2 U mg-1,KM为0.8 mM,Vmax为32.9 μmol min-1 mg-1:40 °C和 pH 值 7.0。该酶在 200 mM 乙醛中孵育 2 小时后保留了 23.3% 的活性,在 100 mM 氯乙醛中孵育 2 小时后保留了 58.2% 的活性。与报道的 DERA 相比,该酶表现出中等活性和醛耐受性。SsDERA 催化 200 mM 乙醛和 100 mM 氯乙醛之间的反应生成 (3R,5S)-6-chloro-2,4,6-三脱氧六吡喃糖在 8 小时内的产率为 76%。该工作为(3R,5S)-6-氯-2