pre-equilibrium in the formation of iminodiazonium (ID) ion and that the N2 liberation from the ID ion is rate-determining. Under high azide concentration conditions, where the effective reactant is the ID ion, the reaction gave a linear Hammett plot with a ρ value of −0.50. The observed substituent effects on the rate and the product selectivity imply that path bifurcation on the way from the rate-determining
BVMO-catalysed dynamic kinetic resolution of racemic benzyl ketones in the presence of anion exchange resins
作者:Cristina Rodríguez、Gonzalo de Gonzalo、Ana Rioz-Martínez、Daniel E. Torres Pazmiño、Marco W. Fraaije、Vicente Gotor
DOI:10.1039/b922693a
日期:——
fluorescens ACB was employed in the presence of a weak anion exchange resin to perform dynamic kinetic resolutions of racemic benzyl ketones with high conversions and good optical purities. Different parameters that affect to the efficiency of the enzymatic Baeyer–Villiger oxidation and racemisation were analyzed in order to optimize the activity and selectivity of the biocatalytic system.
of nitronates arises from the intrinsic barriers, which are ca. 10 kcal/mol lower for O-methylation than for C-methylation. The situation is the same for the gas-phase reaction of an enolate, in which the O-methylation is more favorable than the C-methylation. The experimentally observed C-selectivity of enolate reactions in solution is due to the metal-cation coordination, which hinders O-methylation
Baeyer–Villiger monooxygenase-catalyzed kinetic resolution of racemic α-alkyl benzyl ketones: enzymatic synthesis of α-alkyl benzylketones and α-alkyl benzylesters
作者:Cristina Rodríguez、Gonzalo de Gonzalo、Daniel E. Torres Pazmiño、Marco W. Fraaije、Vicente Gotor
DOI:10.1016/j.tetasy.2009.03.018
日期:2009.6
The application of three BVMOs for the enantioselective oxidation of 3-phenylbutan-2-ones with different substituents in the aromatic moiety is described. By choosing the appropriate biocatalyst and substrate combination, chiral ketones and esters can be obtained with excellent enantiopurities. This methodology could also be applied to the resolution of racemic alpha-alkyl benzylketones with longer alkyl chains as well as with two substituted alpha-substituted benzylacetones. A kinetic analysis revealed that the BVMOs studied effectively convert all tested compounds showing that the enzymes are tolerant towards the substrate structure while being highly enantioselective. These properties render BVMOs as valuable biocatalysts for the preparation of compounds with high interest in organic synthesis. (C) 2009 Elsevier Ltd. All rights reserved.
Substituted Heterocyclyl Derivatives as CDK Inhibitors
申请人:Aurigene Discovery Technologies Limited
公开号:US20180155293A1
公开(公告)日:2018-06-07
The present invention provides substituted heterocyclyl derivatives of formula (I), which are therapeutically useful, particularly as selective transcriptional CDK inhibitors including CDK7, CDK9, CDK12, CDK13 and CDK18, more particularly transcriptional CDK7 inhibitors. These compounds are useful in the treatment and prevention of diseases and/or disorders associated with selective transcriptional CDKs in a mammal. The present invention also provides preparation of the compounds and pharmaceutical formulations comprising at least one of the substituted heterocyclyl derivatives of formula (I) or a pharmaceutically acceptable salt or a stereoisomer thereof.