ω-Unsaturated alcohols were “clipped” via alkene metathesis to a thioester activating group, which was followed by a chiral phosphoric acid catalyzed intramolecular oxa-Michael cyclization to yield tetrahydropyrans and spiro-tetrahydropyrans with excellent enantioselectivity. The mechanism and origin of the enantioselectivity was probed by DFT calculations and kinetic isotope studies, where there was
ω-不饱和醇通过烯烃复分解被“剪裁”成
硫酯活化基团,随后手性
磷酸催化分子内氧杂-迈克尔环化产生具有优异对映选择性的
四氢吡喃和螺-
四氢吡喃。通过 DFT 计算和动力学同位素研究探讨了对映选择性的机制和起源,其中计算和合成研究之间存在极好的相关性。