In the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf) and methoxytrimethylsilane (MeOTMS), 2-oxopropyl acrylate and 2-oxocyclopentyl acrylate readily form cationic intermediates. The cationic moiety works efficiently as an electron-withdrawing group, and accelerates the Diels-Alder reaction under mild conditions.
在
三氟甲磺酸三甲基硅酯(TMSOTf)和甲氧基三甲基
硅烷(MeOTMS)的存在下,
丙烯酸 2-氧代丙基酯和
丙烯酸 2-氧代环戊基酯很容易形成阳离子中间体。阳离子基团可有效地作为一个吸电子基团,并在温和的条件下加速 Diels-Alder 反应。