[EN] POLYMER SUPPORTED FLUORINATED ORGANOCATALYST<br/>[FR] ORGANOCATALYSEUR FLUORÉ SUR SUPPORT POLYMÈRE
申请人:FUNDACIÓ INST CATALÀ D'INVESTIGACIÓ QUÍMICA
公开号:WO2017008832A1
公开(公告)日:2017-01-19
Polymer supported fluorinated compound of formula I, wherein the meaning for each R1 is as disclosed in the description. These compounds are useful as catalysts, particularly in Michael addition reactions under continuous flow.
Oxazaborolidines as Functional Monomers: Ketone Reduction Using Polymer-Supported Corey, Bakshi, and Shibata Catalysts
作者:Michael D. Price、Jennifer K. Sui、Mark J. Kurth、Neil E. Schore
DOI:10.1021/jo026132n
日期:2002.11.1
The first two polymer-supported versions of the Corey, Bakshi, and Shibata (CBS) catalyst have been prepared. Functional monomers based structurally upon the original B-methylated catalyst have been used to prepare catalytic polymers containing the CBS moiety bound both in a pendant fashion and in the form of a cross-link. Enantioselective reductions of two prochiral ketones have been carried out using the original catalyst in the solution phase as well as the two solid-state systems. While the pendant-bound system shows reduced stereoselectivity, the cross-linked version affords enantioselectivities almost identical to those of the solution-phase model.
Comparison of enantioselective reductions using bead and monolith ‘disk’ polymer formulations of CBS catalysts
作者:Michael C. Varela、Seth M. Dixon、Michael D. Price、Jeffrey E. Merit、Patrick E. Berget、Saori Shiraki、Mark J. Kurth、Neil E. Schore
DOI:10.1016/j.tet.2007.02.048
日期:2007.4
Two polymer-supported versions of the Corey, Bakshi, and Shibata (CBS) catalyst were prepared and examined. Polymeric beads, with the auxiliary bound in pendant and crosslinked fashion, were prepared utilizing an improved procedure based upon earlier work. Optimization of a procedure for ketone reduction gives results that match those in solution. Attempted reuse gave mixed results. For comparison purposes, CBS functionalized monoliths were formed and tested but performed poorly. (c) 2007 Elsevier Ltd. All rights reserved.
Translating the Enantioselective Michael Reaction to a Continuous Flow Paradigm with an Immobilized, Fluorinated Organocatalyst
作者:Irina Sagamanova、Carles Rodríguez-Escrich、István Gábor Molnár、Sonia Sayalero、Ryan Gilmour、Miquel A. Pericàs
DOI:10.1021/acscatal.5b01746
日期:2015.11.6
enantioselective, continuous flow processes allowing either the multigram synthesis of a single Michael adduct over a 13 h period or the sequential generation of a library of enantiopure Michael adducts from different combinations of substrates (13 examples, 16 runs, 18.5 h total operation). A customized in-line aqueous workup, followed by liquid–liquid separation in flow, allows for product isolation
Comparison of Solid-Phase and Solution-Phase Chiral Auxiliaries in the Alkylation/Iodolactonization Sequence to γ-Butyrolactones
作者:Michael D. Price、Mark J. Kurth、Neil E. Schore
DOI:10.1021/jo0260692
日期:2002.11.1
prolinol-based chiral auxilaries have been compared for the stereoselectivesynthesis of gamma-butyrolactones via the sequence of N-acylation, C(alpha)()-allylation, and iodolactonization under both solution-phase and solid-phase conditions. Comparisons of stereoselectivity of both the C(alpha)()-allylation and iodolactonization processes indicate that incorporation of a non-C(2)-symmetric auxiliary as a polymer