Asymmetric induction in thia-Diels-Alder reactions of chiral polyfluoroalkylthionocarboxylates
作者:Vadim M. Timoshenko、Sergiy A. Siry、Alexander B. Rozhenko、Yuriy G. Shermolovich
DOI:10.1016/j.jfluchem.2009.11.011
日期:2010.2
A series of chiral S- or O-alkyl thionoesters have been synthesized by treatment of trifluorothioacetyl- or 2,2,3,3-tetrafluorothiopropionyl chloride with corresponding thiols or alcohols. The thia-Diels-Alder reaction of the thionoesters with symmetrical 1,3-dienes proceeds with diastereoselectivity up to 60%. Structures of cycloaddition products and corresponding transition states have been studied at the DFT level of approximation. The experimentally observed diastereomeric excess has been referred to differences in activation energies of transition states, preceding formation of the diastereomeric cycloaducts. (C) 2009 Elsevier B.V. All rights reserved.