Synthesis 2006(20): 3515-3526  
DOI: 10.1055/s-2006-950240
FEATUREARTICLE
© Georg Thieme Verlag Stuttgart · New York

Aqueous-Phase Suzuki-Miyaura Cross-Coupling Reactions of Free Halopurine Bases

Petr Čapek, Milan Vrábel, Zbyněk Hasník, Radek Pohl, Michal Hocek*
Gilead & IOCB Research Center, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague 6, 16610, Czech Republic
Fax: +420(2)20183559; e-Mail: hocek@uochb.cas.cz;
Further Information

Publication History

Received 22 June 2006
Publication Date:
10 October 2006 (online)

Abstract

The Suzuki-Miyaura reaction of 9-unsubstituted 2-, 6-, and 8-halopurine bases with diverse aryl- and alkenylboronic acids in water-acetonitrile mixtures under microwave irradiation was used for the single-step synthesis of arylpurines. In most cases the product crystallized directly from the reaction mixture in high yields and good purity. The scope and limitations of these reactions were studied.

1 Introduction

2 Results and Discussion

2.1 Cross-Coupling Reactions of 6-Chloro-9H-purine

2.2 Cross-Coupling Reactions of 2-Amino-6-chloro-9H-purine

2.3 Cross-Coupling Reactions of 8-Bromoadenine

2.4 Cross-Coupling Reactions of 2-Chloroadenine

2.5 Cross-Coupling Reactions of 2,6-Dichloro-9H-purine

2.6 NMR Analysis of Arylpurines and Determination of Regioselectivity­

3 Conclusions

4 Experimental Section

5 References