Tetrahedron

Asymmetric phase-transfer catalysis of homo-and heterochiral quaternary ammonium salts: development and application of conformationally flexible chiral phase- …

T Ooi, Y Uematsu, M Kameda, K Maruoka

Index: Ooi, Takashi; Uematsu, Yukitaka; Kameda, Minoru; Maruoka, Keiji Tetrahedron, 2006 , vol. 62, # 49 p. 11425 - 11436

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Citation Number: 27

Abstract

Inspired by the considerable difference of catalytic activity and stereocontrolling ability between the conformationally rigid, homo-and heterochiral quaternary ammonium bromides 1, conformationally flexible, N-spiro chiral quaternary ammonium bromides of type 4 have been designed and synthesized. Reliable procedures for the preparation of the appropriately substituted biphenyl subunits have been established by the repeated use of ...