<scp>D</scp>-Fructose-6-phosphate Aldolase in Organic Synthesis: Cascade Chemical-Enzymatic Preparation of Sugar-Related Polyhydroxylated Compounds
作者:Alda Lisa Concia、Carles Lozano、José A. Castillo、Teodor Parella、Jesús Joglar、Pere Clapés
DOI:10.1002/chem.200802532
日期:2009.4.6
D‐Fructose‐6‐phosphate aldolase (FSA) is a key biocatalyst for the alternative synthetic construction of biologically active products with known therapeutic and research interest or novel structures relevant to drug discovery. Novel aldol addition reactions of dihydroxyacetone and hydroxyacetone to a variety of aldehydes catalyzed by FSA are presented (see scheme).
The SmI<sub>2</sub>Mediated Cross-Coupling Reaction of Aldehydes with α-Diketones in Their Aqueous Forms
作者:Norikazu Miyoshi、Seiji Takeuchi、Yoshiaki Ohgo
DOI:10.1246/cl.1993.2129
日期:1993.12
By the use of samarium diiodide (SmI2), a cross-coupling reaction of aldehydes with α-diketones smoothly proceeds in the presence of water to give the corresponding adducts in moderate to good yield. In this reaction, it is possible to use the substrates such as phenylglyoxal monohydrate, aqueous methylglyoxal, formalin, and aqueous α-chloroacetaldehyde.
Polyhydroxylated compounds are buildingblocks for the synthesis of carbohydrates and other natural products. Their synthesis is mainly achieved by different synthetic versions of aldol-coupling reactions, catalyzed either by organocatalysts, enzymes, or metal–organic catalysts. We have investigated the formation of 1,4-substituted 2,3-dihydroxybutan-1-one derivatives from para- and meta-substituted
Cell Factory Design and Optimization for the Stereoselective Synthesis of Polyhydroxylated Compounds
作者:Thomas Wiesinger、Thomas Bayer、Sofia Milker、Marko D. Mihovilovic、Florian Rudroff
DOI:10.1002/cbic.201700464
日期:2018.2.16
cells: A synthetic cascade for the transformation of primary alcohols into polyhydroxylated compounds through in situ preparation of cytotoxic aldehyde intermediates and subsequent aldolase‐mediated C−C bond formation is investigated. The optimized whole‐cell catalyst, combined with a refined solid‐phase extraction downstream purification protocol gives opticallypure aldol products.
furnishing enantioenriched 1,3-amino alcohols out of commodity chemicals. A Type I aldolase forged the carbon backbone with an enantioenriched aldol motif, which was subsequently subjected to enzymatic transamination. A panel of 194 TAs was tested on diverse nine aldol products prepared through different nucleophiles and electrophiles. Due to the availability of (R)- and (S)-selective TAs, both diastereomers
尽管光学纯氨基醇因其广泛的适用性而需求量很大,但由于需要通常详细的保护策略,因此它们的合成仍然具有挑战性。在这里,提出了一种多酶方法,该方法绕过了这一障碍,从商品化学品中提供富含对映体的 1,3-氨基醇。I 型醛缩酶用对映体富集的羟醛基序形成碳骨架,随后进行酶促转氨化。一组 194 种 TA 在通过不同亲核试剂和亲电试剂制备的不同 9 种羟醛产品上进行了测试。由于 (R) 和 (S) 选择性 TA 的可用性,1,3-氨基醇基序的两种非对映异构体都是可及的。两步法工艺能够合成所需的氨基醇,最终产品中具有多达三个手性中心,de 高达 >97。