Temperature controlled stereoselectivity in the synthesis of 5-halo-2′-deoxyuridine derivatives
作者:Tom Lagerwall、Petri Heinonen、Mikko Oivanen
DOI:10.1016/j.tetlet.2015.09.061
日期:2015.10
A series of alpha- and beta-5-halo-2'-deoxyuridine derivatives were prepared with high anomeric selectivity using the conventional silylbase glycosylation method and taking advantage of the 3'-O-(N-acetyl)glycyl protection group and temperature control. Reactions performed at 7 degrees C gave as much as 87% of the beta-anomers, while an overnight reaction at 30 degrees C gave up to 95% of the alpha-anomers. (C) 2015 Elsevier Ltd. All rights reserved.