在本文中,我们报道了在炔基砜存在下,通过臭氧介导和 Fe II催化的未活化烯烃的脱烯基炔基化合成烷基链炔烃。这种一锅反应采用催化 Fe II盐和L-抗坏血酸的组合,在温和的条件下进行,具有良好的效率、高立体选择性和广泛的官能团兼容性。与我们之前的 Fe II介导的 α-甲氧基氢过氧化物还原断裂相比,Fe II催化的过程是通过对多个竞争自由基(氧化还原)途径进行彻底的动力学分析而设计的。我们强调了这种脱烯基炔基化通过复杂分子(包括天然产物和药物)的多次合成后转化和后期多样化的潜力。
Novel concurrent redox cascades of (R)- and (S)-carvones enables access to carvo-lactones with distinct regio- and enantioselectivity
作者:Naseem Iqbal、Jon D. Stewart、Peter Macheroux、Florian Rudroff、Marko D. Mihovilovic
DOI:10.1016/j.tet.2018.11.005
日期:2018.12
Within this study, we investigated a one-pot enzymatic redox cascade composed of different enoate reductases (5 EREDs from diverse bacterial origins) and various Baeyer-Villigermonooxygenases (4 BVMOs) with complementary regioselectivity that enabled access to six out of eight carvo-lactone stereoisomers starting from readily available natural carvones. Applicability of this two-step cascade was demonstrated
Microbial Baeyer–Villiger oxidation of terpenones by recombinant whole-cell biocatalysts—formation of enantiocomplementary regioisomeric lactones
作者:Petra Černuchová、Marko D. Mihovilovic
DOI:10.1039/b703175k
日期:——
Recombinant whole-cell expression systems for BaeyerâVilliger monooxygenases of various bacterial origin were utilized in the regiodivergent biooxidation of cyclic terpenones enabling access to enantio- and regioisomeric lactones on preparative scale.
Purification and characterization of a Baeyer‒Villiger mono-oxygenase from Rhodococcus erythropolis DCL14 involved in three different monocyclic monoterpene degradation pathways
作者:Mariët J. VAN DER WERF
DOI:10.1042/0264-6021:3470693
日期:2000.5.1
A Baeyer-Villiger mono-oxygenase (BVMO), catalysing the NADPH- and oxygen-dependent oxidation of the monocyclicmonoterpene ketones 1-hydroxy-2-oxolimonene, dihydrocarvone and menthone, was purified to homogeneity fromRhodococcuserythropolisDCL14. Monocyclicmonoterpene ketone mono-oxygenase (MMKMO) is a monomeric enzyme of molecular mass 60 kDa. It contains 1 mol of FAD/monomer as the prosthetic
Genetic and Biochemical Characterization of a Novel Monoterpene ɛ-Lactone Hydrolase from
<i>Rhodococcus erythropolis</i>
DCL14
作者:Cécile J. B van der Vlugt-Bergmans、Mariët J. van der Werf
DOI:10.1128/aem.67.2.733-741.2001
日期:2001.2
A monoterpene epsilon-lactone hydrolase (MLH) fromRhodococcuserythropolisDCL14, catalyzing the ring opening of lactones which are formed during degradation of several monocyclicmonoterpenes, including carvone and menthol, was purified to apparent homogeneity. It is a monomeric enzyme of 31 kDa that is active with (4R)-4-isopropenyl-7-methyl-2-oxo-oxepanone and (6R)-6-isopropenyl-3-methyl-2-oxo-oxepanone
Crystal Structures of Cyclohexanone Monooxygenase Reveal Complex Domain Movements and a Sliding Cofactor
作者:I. Ahmad Mirza、Brahm J. Yachnin、Shaozhao Wang、Stephan Grosse、Hélène Bergeron、Akihiro Imura、Hiroaki Iwaki、Yoshie Hasegawa、Peter C. K. Lau、Albert M. Berghuis
DOI:10.1021/ja9010578
日期:2009.7.1
Cyclohexanone monooxygenase (CHMO) is a flavoprotein that carries out the archetypical Baeyer-Villiger oxidation of a variety of cyclic ketones into lactones. Using NADPH and O-2 as cosubstrates, the enzyme inserts one atom of oxygen into the substrate in a complex catalytic mechanism that involves the formation of a flavin-peroxide and Criegee intermediate. We present here the atomic structures of CHMO from an environmental Rhodococcus strain bound with FAD and NADP(+) in two distinct states, to resolutions of 2.3 and 2.2 angstrom. The two conformations reveal domain shifts around multiple linkers and loop movements, involving conserved arginine 329 and tryptophan 492, which effect a translation of the nicotinamide resulting in a sliding cofactor. Consequently, the cofactor is ideally situated and subsequently repositioned during the catalytic cycle to first reduce the flavin and later stabilize formation of the Criegee intermediate. Concurrent movements of a loop adjacent to the active site demonstrate how this protein can effect large changes in the size and shape of the substrate binding pocket to accommodate a diverse range of substrates. Finally, the previously identified BVMO signature sequence is highlighted for its role in coordinating domain movements. Taken together, these structures provide mechanistic insights into CHMO-catalyzed Baeyer-Villiger oxidation.