Tricyclo[3,3,1,01,5]nonan-tetracarbonsäure-(3,3,7,7)-tetraäthylester, 3,7-Dithia-tricyclo[3,3,1,01,5]nonan und 3,7-Dithia-tricyclo[3,3,2,01,5]decan

Abstract

The compound II is obtained by condensation of the tetramesylate Ic with sodium diethyl malonate in toluene. The dithiacompounds III and V are formed by refluxing of Ic respectively 1,1,2,2-tetrakis-hydroxymethyl-cyclobutane-tetramesylate with Na2S ∙ 9 H2O in dioxane/ethanol. The oxydation of III with H2O2 in acetic acid gives the tetrahydrothiapyrane-derivate IV.