Thermal and Sc(OTf)3 catalyzed 1,3-dipolar cycloaddition of open-chain nitrones to α,β-unsaturated lactones: combined experimental and computational studies
作者:Marcin Śnieżek、Sebastian Stecko、Irma Panfil、Bartłomiej Furman、Zofia Urbańczyk-Lipkowska、Marek Chmielewski
DOI:10.1016/j.tetasy.2012.12.006
日期:2013.2
selectivity. The energies of the cycloaddition reactions were investigated by means of molecular orbital calculations at the B3LYP/6-31+G(d,p) and MP3/6-31+G(d,p) theory level. Different reaction channels and reactant approaches, fitting the individual regio- and stereochemical preferences, are discussed. The computational results were compared with the corresponding experimental data and found to be in good
在热和催化条件下,研究了C-苯基开链硝酮与α,β-不饱和γ-和δ-内酯的1,3-偶极环加成反应的立体选择性。已经发现,在热条件下,反应物的内部方法是优选的,从而导致产生热力学产物。在钪(OTF)的存在3的外以高收率和选择性获得加合物。通过分子轨道计算在B3LYP / 6-31 + G(d,p)和MP3 / 6-31 + G(d,p)理论水平上研究了环加成反应的能量。讨论了适合个体区域和立体化学偏好的不同反应通道和反应物方法。计算结果与相应的实验数据进行了比较,发现吻合良好。