HSAB-driven chemoselective N1-alkylation of pyrimidine bases and their 4-methoxy- or 4-acetylamino-derivatives
作者:Augusto Gambacorta、Daniela Tofani、Maria Antonietta Loreto、Tecla Gasperi、Roberta Bernini
DOI:10.1016/j.tet.2006.04.098
日期:2006.7
The lithium salts of the conjugated bases of 4-methoxy- and 4-acetylamino-2(1H)-pyrimidinones 1-3 undergo highly chemoselective N-1-methylation or ethylation when treated with methyl- or ethylsulfate (hard electrophiles) in dry dioxane, while the use of DMF as solvent results in competitive O-2-alkylation. Potassium salts of the same bases in DMF undergo prevalent O-2-attack. Under the same conditions, a similar but less chemoselective behaviour is observed in alkylation of thymine and uracil, where some N-3 -attack occurs. This can be rationalised in terms of the HSAB principle. (c) 2006 Elsevier Ltd. All rights reserved.