Synthesis 2005(16): 2631-2653  
DOI: 10.1055/s-2005-869961
REVIEW
© Georg Thieme Verlag Stuttgart · New York

N-Alkylation Reactions and Indirect Formation of Amino Functionalities in Solid-Phase Synthesis

Christian A. Olsen*, Henrik Franzyk, Jerzy W. Jaroszewski
Department of Medicinal Chemistry, The Danish University of Pharmaceutical Sciences, Universitetsparken 2, 2100 Copenhagen, Denmark
Fax: +4535306041; e-Mail: cao@dfuni.dk;
Further Information

Publication History

Received 21 April 2005
Publication Date:
26 August 2005 (online)

Abstract

Aliphatic and aromatic amino functionalities are present in a wide variety of natural products and drugs, as well as in synthetic small molecular probes with therapeutic and/or diagnostic potential in drug discovery. As solid-phase synthesis and combinatorial chemistry have emerged as important tools for generation of compound libraries, development of broad-scope and efficient chemistry for the introduction of various functional groups into resin-anchored substrates is highly important. Herein, we present a review of the literature concerning formation of the amino functionality on solid phase.

  • 1 Introduction

  • 2 Reductive Methods

  • 2.1 Reductive Amination

  • 2.2 Reduction of Amides/Peptides

  • 2.3 Primary Amines by Miscellaneous Reductions

  • 3 SN2 Alkylation and Michael Addition

  • 3.1 Halogen Displacement

  • 3.2 Sulfonate Displacement

  • 3.3 Epoxide Opening and Michael Additions

  • 4 Fukuyama Sulfonamide Alkylations

  • 4.1 Mitsunobu Conditions

  • 4.2 Alkyl Halides and Alkyl Sulfonates

  • 5 Aza-Wittig and Staudinger Reactions

  • 6 Palladium-Catalyzed and Other Aryl Aminations

  • 7 Miscellaneous

  • 8 Conclusions