The Stereochemical Outcome of the DAST Fluorination of 4′-Thiopyrimidine Nucleosides with “Up” Hydroxyl Groups is Controlled by the Oxidation State of the Sulfur Atom
作者:Lak S. Jeong、Victor E. Marquez
DOI:10.1246/cl.1995.301
日期:1995.4
DAST fluorination of 1-(5-O-trityl-3-deoxy-4-thio-β-d-threo-pentofuranosyl)uracil proceeds with retention of configuration, while the corresponding sulfoxide gives mainly the inverted product. The sulfone proceeds with elimination.
1-(5-O-三苯甲基-3-脱氧-4-硫代-β-D-苏式-呋喃戊糖基)尿嘧啶的DAST氟化反应在保持构象不变的情况下进行,而相应的亚砜主要产生反式产物。砜则发生消除反应。