作者:Zdravko Džambaski、Rade Marković、Erich Kleinpeter、Marija Baranac-Stojanović
DOI:10.1016/j.tet.2013.05.087
日期:2013.8
A series of 5-unsubstituted and 5-substituted 2-alkylidene-4-oxothiazolidine-S-oxides were synthesized by the sulfur-oxidation with m-CPBA. The stereochemistry of 5-substituted sulfoxides was determined by means of NMR spectroscopy and DFT theoretical calculations. It was found that the thermodynamically less stable anti-isomer was initially formed in the course of the oxidation, but it underwent epimerization
一系列5-未取代的和的5-取代的2-亚烷基-4- oxothiazolidine-小号-oxides是由硫氧化与合成米-CPBA。通过NMR光谱和DFT理论计算确定5-取代的亚砜的立体化学。据发现,热力学不太稳定的抗最初形成在氧化过程中异构体,但它经历差向异构化至该混合物中更稳定的富集顺式异构体,在工作过程。顺式异构体的较高稳定性归因于较强的超共轭σC –H →σ* S-O相互作用,而较弱的σC –C →σ*S-O在其反配体中的离域化以及分子内1,5-CH = O氢键的存在。