Iron(III)-Catalyzed Halogenations by Substitution of Sulfonate Esters
作者:Nuria Ortega、Andrés Feher-Voelger、Margarita Brovetto、Juan I. Padrón、Victor S. Martín、Tomás Martín
DOI:10.1002/adsc.201000740
日期:2011.4.18
A novel halogenation reaction from sulfonates catalyzed by iron(III) is described. The reaction can be performed as a stoichiometric or a catalytic version. This reaction provides a convenient strategy for the efficient access to structurally diverse secondary chlorides, bromides and iodides. The stereochemical course of the reaction is governed by the substrate and the experimental conditions. Secondary
Enantioselectivity of Haloalkane Dehalogenases and its Modulation by Surface Loop Engineering
作者:Zbynek Prokop、Yukari Sato、Jan Brezovsky、Tomas Mozga、Radka Chaloupkova、Tana Koudelakova、Petr Jerabek、Veronika Stepankova、Ryo Natsume、Jan G. E. van Leeuwen、Dick B. Janssen、Jan Florian、Yuji Nagata、Toshiya Senda、Jiri Damborsky
DOI:10.1002/anie.201001753
日期:2010.8.16
In the loop: Engineering of the surfaceloop in haloalkanedehalogenases affects their enantiodiscrimination behavior. The temperature dependence of the enantioselectivity (lnE versus 1/T) of β‐bromoalkanes by haloalkanedehalogenases is reversed (red data points) by deletion of the surfaceloop; the selectivity switches back when an additional single‐point mutation is made. This behavior is not observed
Enantiospecific Solvolytic Functionalization of Bromochlorides
作者:Alexander J. Burckle、Bálint Gál、Frederick J. Seidl、Vasil H. Vasilev、Noah Z. Burns
DOI:10.1021/jacs.7b07792
日期:2017.9.27
Herein, we report that under mild solvolytic conditions, enantioenriched bromochlorides can be ionized, stereospecifically cyclized to an array of complex bromocyclic scaffolds, or intermolecularly trapped by exogenous nucleophiles. Mechanistic investigations support an ionic mechanism wherein the bromochloride serves as an enantioenriched bromonium surrogate. Several natural product-relevant motifs
Abstract Mechanism of a novel transformation of the alkyl phenyltellurides to alkyl halides via nucleophilic substitution of the phenyltelluro group in organotelluriums is studied on the basis of kinetics and stereochemistry using the titled chiral substrate. The results obtained strongly suggest that the substitutions proceed via SN2 mechanism with Walden inversion and very low Arrhenius' energies
NOVEL 2,3-DIHYDRO-1H-IMIDAZO(1,2-A)PYRIMIDIN-5-ONE DERIVATIVES, PREPARATION THEREOF, AND PHARMACEUTICAL USE THEREOF
申请人:Brolio Maurice
公开号:US20120142679A1
公开(公告)日:2012-06-07
The invention relates to the novel materials of formula (I), where R
1
is an optionally substituted L-aryl or
-heteroaryl, such that L is: an alkyl or CO, or L
X, with L
being an alkyl and X being O or S; R
2
is H or an alkyl; R
3
is an alkyl optionally substituted by Hal; and R
4
is Hou Hal, wherein said materials are in any isomeric form and the salts thereof, to be used as drugs.