Enzyme-Catalyzed Carbonyl Olefination by the<i>E. coli</i>Protein YfeX in the Absence of Phosphines
作者:Martin J. Weissenborn、Sebastian A. Löw、Niels Borlinghaus、Miriam Kuhn、Stefanie Kummer、Fabian Rami、Bernd Plietker、Bernhard Hauer
DOI:10.1002/cctc.201600227
日期:2016.5.9
olefination reaction has no biocatalytic equivalent. To build complex molecular scaffolds, however, C−C bond‐forming reactions are pivotal for biobased economy and synthetic biology. The heme‐containing E. coli protein YfeX was found to catalyze carbonyl olefination by reaction of benzaldehyde with ethyl diazoacetate under aerobic conditions in the absence of a triphenylphosphine oxophile. The reaction was
Wittig型羰基烯烃化反应没有生物催化等效物。然而,要构建复杂的分子支架,CC键形成反应对于基于生物的经济和合成生物学至关重要。发现在不存在三苯基膦亲氧物质的情况下,在有氧条件下,苯甲醛与重氮乙酸乙酯反应,可以使含血红素的大肠杆菌蛋白YfeX催化羰基烯化反应。该反应在全细胞中进行,显示在1小时内形成440 mg L -1的产物 。此外,还表明该反应可以在三苯基膦或三苯基s存在的情况下,在维蒂希模拟条件下进行。
Ring‐Opening Cyclization of Spirocyclopropanes with Stabilized Phosphorus Ylides: Access to Indane and Azulene Skeletons
In this study, regio- and diastereoselective ring-opening cyclization of spirocyclopropanes with phosphorus ylides stabilized by electron-withdrawing groups were developed. The reaction of various cyclohexane-1,3-dione-2-spirocyclopropanes with phosphorus ylides bearing alkoxycarbonyl groups proceeded smoothly without any additives to provide the corresponding 6,7-dihydroindan-4-ones in 32–87% yields