Catalytic Asymmetric Synthesis. Группа авторов

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4 ASYMMETRIC PHASE‐TRANSFER AND ION‐PAIR ORGANOCATALYSES

      Edward Miller, Patrick J. Moon, and F. Dean Toste

       University of California, Berkeley, Berkeley, CA, USA

4.1. INTRODUCTION

Asymmetric organocatalysis has become a powerful strategy for the construction of chiral functional molecules and materials, providing unique reactivity manifolds compared to traditional metal‐catalyzed or enzymatic‐based approaches. Within the field, reversible covalent substrate activation or binding with a chiral catalyst (enamine, iminium, or N‐heterocyclic carbene [NHC] catalysis) has been extensively exploited to achieve highly enantioselective transformations. Conformational analysis of the catalyst‐bound intermediates has permitted the rationalization of the origin of enantioselectivity in a number of reactions, which in turn has helped drive catalyst design with relative ease. Another approach involves the use of noncovalent interactions as the basis for substrate activation and asymmetric induction. Within this category, asymmetric phase‐transfer and ion‐pairing catalyses have proven to be uniquely suited to achieve highly selective reactions involving charged substrates or intermediates (Scheme 4.1). This chapter will cover key historical and recent developments in the area of chiral cation phase‐transfer and cation‐binding catalyses, in addition to more recent advances in chiral‐anion (phase‐transfer) and anion‐binding catalyses. Additionally, examples featuring transition‐metal and phase‐transfer dual catalysis will also be highlighted.

4.2. CHIRAL CATION

      4.2.1. Chiral Cation Phase‐Transfer Catalysis

       4.2.1.1. Alkylation

In 1984, Dolling reported the enantioselective methylation of an indanone derivative using a cinchoninium salt phase‐transfer catalyst (PTC, Scheme 4.2) [1]. While phase‐transfer catalysis had already been reported to yield racemic alkylation products, the significance of this landmark study cannot be understated since it demonstrated that chiral information from a catalytically generated ion‐pair could be transferred in an alkylation step to achieve high enantiocontrol. Enantioselectivity is rationalized from a composite of electrostatic, hydrogen bonding, and π–π interactions that selectively block one face of the enolate, allowing for selective alkylation. This ensemble of various noncovalent interactions is a key feature of ion‐pairing catalysis [2].

Scheme 4.1. СКАЧАТЬ