Alkyl iodides and benzoyl peroxides provide a new general method of homolytic alkylation of protonated heteroaromatic bases. Yields are good and the substitution is selective in the positions ortho and para to the heteroatom.
Tris(trimethylsilyl)silane in the Alkylation of Heteroaromatic Bases with Alkyl Halides
作者:Hideo Togo、Ken Hayashi、Masataka Yokoyama
DOI:10.1246/cl.1993.641
日期:1993.4
Protonated heteroaromatic bases were easily alkylated via radical pathways using alkyl halides in the presence of tris(trimethylsilyl)silane under photochemical or thermal conditions.
Reactivity of 1,1,2,2-tetraaryldsilanes as a radical reagent in ethanol was studied in reduction of alkyl bromides, addition to olefins and alkylation onto heteroaromatic bases with alkyl bromides. The present organodisilanes showed moderate to good reactivities for these three types of radical reactions. Among some disilanes prepared, 1,1,2,2-tetraphenyldisilane is the most useful in view of its reactivity and ease of preparation. (C) 1999 Elsevier Science Ltd. All rights reserved.