Synthesis 2004(17): 2886-2892  
DOI: 10.1055/s-2004-831254
PAPER
© Georg Thieme Verlag Stuttgart · New York

Nicotinoyl Azide (NCA)-Mediated Mitsunobu Reaction: An Expedient One-Pot Transformation of Alcohols into Azides

Gianluca Papeo*, Helena Posteri, Paola Vianello, Mario Varasi
Department of Chemistry, BU-Oncology, Nerviano Medical Science, Viale Pasteur 10, 20014 Nerviano (MI), Italy
Fax: +39(033)1581757; e-Mail: gianluca.papeo@nervianoms.com;
Further Information

Publication History

Received 28 July 2004
Publication Date:
07 October 2004 (online)

Abstract

A practical and simple method that allows preparation of azides from alcohols is described. The process involves oxyphosphonium-type activation and it is based upon the use of nicotinoyl azide (NCA), a cheap and easily accessible azide ion source.

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DSC (Mettler-Toledo Star® System, heating rate: 10 °C min-1): endothermic effect between 40 °C and 66 °C (melting of the reagent, ΔHendo = 106 J g-1); exothermic effect between 73 °C and 151 °C (Schmidt rearrangement plus decomposition, ΔHexo = 1051 J g-1).

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1H NMR (300 MHz, CDCl3): δ = 1.24-1.31 (m, 6 H), 4.15-4.27 (m, 4 H), 7.35-7.42 (m, 1 H), 7.96-7.98 (d, J = 7.6 Hz, 1 H), 8.71-8.73 (d, J = 5 Hz, 1 H), 8.86 (s, 1 H). MS m/z = 282.26 (MH+).