Fluorinated alcohol directed formation of dispiro-1,2,4,5-tetraoxanes by hydrogen peroxide under acid conditions
作者:Katja Žmitek、Stojan Stavber、Marko Zupan、Danièle Bonnet-Delpon、Jernej Iskra
DOI:10.1016/j.tet.2005.11.022
日期:2006.2
system MTO/30%H2O2/HBF4/fluorous alcohol is promising for the selective synthesis of biologically important antimalarial dispiro-1,2,4,5-tetraoxanes by direct acid-catalysed cyclisation of various 4-substituted cyclohexanones (1, R=Me, Et, tBu, Ph, COOEt, CF3). The role of the substitutent at the 4-position was important in the selectivity of formation of tetraoxane (2, TO) with respect to hexaoxonane
氧化系统MTO / 30%H 2 O 2 / HBF 4 /氟代醇有望通过直接酸催化的各种4-取代的环己酮的环化反应,选择性地合成生物学上重要的抗疟药二螺-1,2,4,5-四恶烷。 (1,R = Me,Et,t Bu,Ph,COOEt,CF 3)。取代基在4位上的作用对于形成四恶烷(2,TO)相对于六恶烷(3,HO)的选择性很重要。通过使用氟化醇并在正确的反应条件下,四恶烷2从4取代的环己酮1中选择性形成并合成,收率为46–86%。