Journal
TETRAHEDRON LETTERS
Volume 53, Issue 22, Pages 2689-2693Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2012.03.063
Keywords
Hunig's base; N,N-diisopropylethylamine; Magnetic nanoparticles; Solid supported reagent
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Funding
- Center of Excellence for Innovation in Chemistry (PERCH-CIC)
- National Research University under Thailand's Office of the Higher Education Commission
- Research Professional Development Project: Under the Science Achievement Scholarship of Thailand (SAST)
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A magnetic nanoparticle supported N,N-diisopropylaminoacetamide (Fe3O4-DIPA) was developed for application as a magnetic recoverable, and reusable N,N-diisopropylethylamine equivalent. The Fe3O4 nanoparticles were coated with a silica layer using the sol-gel method, followed by surface modification with 3-aminopropyltriethoxysilane. Subsequent acylation with chloroacetyl chloride and chlorine displacement with diisopropylamine afforded Fe3O4-DIPA in 90% yield with a loading of 0.96 mmol/g. The applicability of Fe3O4-DIPA was demonstrated in the synthesis of amine derivatives cv sulfonation, acylation, and N-alkylation reactions. The desired products were obtained in excellent yields and purities after scavenging the residual starting amines by treatment with silica-supported dichlorotriazine. Fe3O4-DIPA was readily recovered by separation using a magnet and could be reused several times without significant loss of reactivity. (C) 2012 Elsevier Ltd. All rights reserved.
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