Asymmetric epoxidation of alkenes and benzylic hydroxylation with P450tol monooxygenase from Rhodococcus coprophilus TC-2
作者:Aitao Li、Shuke Wu、Joseph P. Adams、Radka Snajdrova、Zhi Li
DOI:10.1039/c4cc03491k
日期:——
P450tol monooxygenase was discovered as a unique and highly enantioselective enzyme for asymmetric epoxidation of some terminal alkenes containing electron-withdrawing groups and benzylic hydroxylation of several ethylbenzenes giving the corresponding useful and valuable products, such as (R)-2- and 3-substituted styrene oxides, (S)-4-substituted styrene oxides, and (S)-benzylic alcohols, in high ee
Multistep Organic Transformations over Base-Rhodium/Diamine-Bifunctionalized Mesostructured Silica Nanoparticles
作者:Hang Liao、Yajie Chou、Yu Wang、Han Zhang、Tanyu Cheng、Guohua Liu
DOI:10.1002/cctc.201700436
日期:2017.8.23
enantioselectivities, in which the asymmetric transfer hydrogenation of α-haloketones followed by epoxidation provides various chiral aryloxiranes, and the amination of α-haloketones with anilines followed by asymmetric transfer hydrogenation produces various β-aminoalcohols. Furthermore, the catalyst can be recovered and recycled for seven times without a loss of catalytic activity, which is an attractive
在非均相不对称催化中,在一个介孔二氧化硅中将多种催化官能团作为催化剂用于环境友好介质中的多步对映选择性有机转化是一个重大挑战。在本文中,我们采取了BF的优点4 -阴离子氢键策略来锚手性阳离子铑/二胺碱官能化的介孔结构的二氧化硅纳米粒子内复杂方便地构造一个双功能的非均相催化剂。固态13 C NMR光谱揭示了定义明确的手性Rh /二胺活性物质,我们使用了XRD,N 2吸附-解吸和电子显微镜揭示有序的介观结构。二氧化硅纳米粒子中双官能团的结合实现了两种高效的对映选择性有机转化,具有高收率和对映选择性,其中α-卤代酮的不对称转移加氢,然后环氧化提供了各种手性芳基氧杂环戊烷,以及随后将α-卤代酮与苯胺胺化通过不对称转移氢化产生各种β-氨基醇。此外,该催化剂可被回收和再循环七次而不会损失催化活性,这对于可持续的良性过程中的多步有机转化而言是一个吸引人的特征。
Asymmetric azidohydroxylation of styrene derivatives mediated by a biomimetic styrene monooxygenase enzymatic cascade
作者:Lía Martínez-Montero、Dirk Tischler、Philipp Süss、Anett Schallmey、Maurice C. R. Franssen、Frank Hollmann、Caroline E. Paul
DOI:10.1039/d1cy00855b
日期:——
established a cascade for the asymmetric azidohydroxylation of styrene derivatives leading to chiral substituted 1,2-azido alcohols via enzymatic asymmetric epoxidation, followed by regioselective azidolysis, affording the azido alcohols with up to two contiguous stereogenic centers. A newly isolated two-component flavoprotein styrene monooxygenase StyA proved to be highly selective for epoxidation
Peroxygenase‐Catalysed Epoxidation of Styrene Derivatives in Neat Reaction Media
作者:Marine C. R. Rauch、Florian Tieves、Caroline E. Paul、Isabel W. C. E. Arends、Miguel Alcalde、Frank Hollmann
DOI:10.1002/cctc.201901142
日期:2019.9.19
Biocatalytic oxyfunctionalisation reactions are traditionally conducted in aqueous media limiting their production yield. Here we report the application of a peroxygenase in neatreaction conditions reaching product concentrations of up to 360 mM.
Influence of an ortho-sulfinyl group on the configurational stability of α-lithiated aryloxiranes: deuteration of tolylsulfinyl styrene oxides
作者:Vito Capriati、Saverio Florio、Renzo Luisi、Antonio Salomone、Maria Giovanna Tocco、Ana M. Martín Castro、José Luis García Ruano、Esther Torrente
DOI:10.1016/j.tet.2008.10.021
日期:2009.1
and stereoselectivity of the deuteration reactions of substituted styrene oxides has been investigated. The sulfinyl group at an ortho-position reduces the configurational stability of α-lithiated styrene oxides, whereas meta- and para-sulfinyl derivatives completely control the regioselectivity only yielding deuterated products at the aromatic ring due to its strong ortho-director effect.