Synlett 2012; 23(6): 837-850
DOI: 10.1055/s-0031-1289641
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© Georg Thieme Verlag Stuttgart · New York

Development of Noncovalent Supported Ionic Liquid Phase Catalyst (SILPC) for Liquid-Phase Reaction as a Benign and Sustainable Protocol to Immobilize Homogeneous Catalyst

Hisahiro Hagiwara*
Graduate School of Science and Technology, Niigata University, 8050, 2-Nocho, Ikarashi, Nishi-ku, Niigata 950-2181 Japan, Email: hagiwara@gs.niigata-u.ac.jp
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Further Information

Publication History

Received: 22 August 2011

Publication Date:
09 February 2012 (online)


Abstract

Homogeneous catalysts were immobilized to the pores of amorphous inorganic supports with the aid of an ionic liquid as Pd-, Cu-, and Ru-supported ionic liquid phase catalyst (SILPC), which is a benign method to immobilize sophisticated but unstable homogeneous catalysts so far difficult to load in an inorganic support by simple impregnation method. By immobilizing as a SILPC, sustainability and reactivity of catalysts increased in Mizoroki–Heck reaction, Suzuki–Miyaura reaction, Huisgen [3+2] cycloaddition (click reaction) without external ligand in aqueous media and ambient atmosphere, and olefin metathesis reactions. In addition, palladium was immobilized on nano-silica gel dendrimer as a nano-SILPC, which was highly active to Suzuki–Miyaura reaction. Moreover, MacMillan imidazolidinone organomolecular catalyst was immobilized as a Mac-SILPC to enable sustainable asymmetric Diels–Alder reaction. SILPCs could be repeatedly used by filtration.

1 Introduction

2 Recyclable Mizoroki–Heck Reaction in an Ionic Liquid Catalyzed­ by Pd/C

3 Immobilization of Pd in an Amorphous Inorganic Oxide with the Aid of an Ionic Liquid – Preparation of Pd-SILPC

4 Mizoroki–Heck Reaction Catalyzed by Pd-SILPC

5 Mizoroki–Heck Reaction in Water Catalyzed by Pd-SILPC

6 Suzuki–Miyaura Reaction Catalyzed by Pd-SILPC

7 Immobilization of Pd in Nano-Silica Gel Dendrimer as Pd-Nano-SILPC and Suzuki–Miyaura Reaction

8 Polymer-Coated Pd-SILPC and Suzuki–Miyaura Reaction

9 Catalytic Hydrogenation Catalyzed by Pd-SH-SILPC

10 Immobilization of Cu as Cu-SILPC and Huisgen [3+2] Cycloaddition­

11 Immobilization of Grubbs Catalyst as Ru-SILPC and Olefin Metathesis Reaction

12 Immobilization of MacMillan Organocatalyst as Mac-SILPC and Asymmetric Diels–Alder Reaction

13 Conclusions