Synthesis 2021; 53(16): 2777-2786
DOI: 10.1055/a-1472-7999
short review

Assisted by Hydrogen-Bond Donors: Cinchona Quaternary Salts as Privileged Chiral Catalysts for Phase-Transfer Reactions

Maciej Majdecki
,
,
Agata Tyszka-Gumkowska
,
Janusz Jurczak
We would like to acknowledge Narodowe Centrum Nauki (National Science Centre, Poland; Project 2016/21/B/ST5/03352) for financial support.


Abstract

This short review is devoted to asymmetric phase-transfer reactions that employ hybrid ammonium Cinchona catalysts supported by possessing hydrogen-bond donor groups. We present recent advances utilizing this type of catalyst in the field of biphasic reaction systems. The main emphasis is placed on the advantages of additional functional groups present in the structure of the catalyst, such as hydroxy, amide, (thio)urea or squaramide.

1 Introduction

2 Phase-Transfer Hybrid Cinchona Catalysts with a Free Hydroxy Group

3 (Thio)urea Hybrid Cinchona Catalysts

4 Hybrid Amide-Based Catalysts Bearing a Cinchona Scaffold

5 Conclusions



Publication History

Received: 02 March 2021

Accepted after revision: 01 April 2021

Accepted Manuscript online:
01 April 2021

Article published online:
19 April 2021

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