1112362-01-2Relevant academic research and scientific papers
Unusual totally selective cyclodimerization of epoxides: Synthesis of a pair of diastereoisomers of enantiopure 2,5-disubstituted-1,4-dioxanes with C2 symmetry
Concellon, Jose M.,Bernad, Pablo L.,Del Solar, Virginia,Garcia-Granda, Santiago,Diaz, M. Rosario
experimental part, p. 477 - 481 (2009/04/06)
The synthesis of the C2-symmetrical (2R,5R)- and (2S,5S)-2,5-bis-[(S)-1-(dibenzylaminoalkyl)]-1,4-dioxanes 1 or 2 in enantiopure form is reported. Compounds 1 and 2 were obtained by a completely selective and unusual cyclodimerization of chiral (2R,1′S)- or (2S,1′S)-2-(1- aminoalkyl)epoxides 3 or 4 promoted by a mixture of diisopropylamine and boron trifluoride-diethyl etherate complex. The structure of the obtained dioxane was established by single-crystal X-ray diffraction analysis. A mechanism has been proposed to explain this transformation.
