Abstract

An efficient domino 1,6-addition/intramolecular cyclization reaction between para-quinone methides (p-QMs) and azlactones under Brønsted acid catalysis was established. A series of highly functionalized dihydrocoumarins were constructed in good to excellent yields (up to 96%) with excellent diastereoselectivities (all >20:1 d.r.). In this process, the Brønsted acid plays a crucial role not only in activating the two substrates, but also in controlling the diastereoselectivity of the reaction via hydrogen-bonding interactions. In addition, this protocol demonstrates the great practicability of utilizing p-QMs in domino reactions.

An efficient domino 1,6-addition/intramolecular cyclization reaction between para-quinone methides (p-QMs) and azlactones under Brønsted acid catalysis was established. A series of highly functionalized dihydrocoumarins were constructed in good to excellent yields (up to 96%) with excellent diastereoselectivities (all >20:1 d.r.). In this process, the Brønsted acid plays a crucial role not only in activating the two substrates, but also in controlling the diastereoselectivity of the reaction via hydrogen-bonding interactions. In addition, this protocol demonstrates the great practicability of utilizing p-QMs in domino reactions.

中文翻译：

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布朗斯台德酸催化多米诺骨牌1,6-加成/分子内环化反应：二氢香豆素骨架的非对映选择性合成

摘要

建立了在布朗斯台德酸催化下对醌甲基化物（p -QMs）与and内酯之间有效的多米诺1，6-加成/分子内环化反应。构建了一系列具有高度非对映选择性（所有> 20：1 dr）的高功能化二氢香豆素，收率良好至优异（高达96％）。在此过程中，布朗斯台德酸不仅在活化两种底物方面起着至关重要的作用，而且在通过氢键相互作用控制反应的非对映选择性方面也起着至关重要的作用。另外，该方案证明了在多米诺反应中利用p -QMs的巨大实用性。

建立了在布朗斯台德酸催化下对醌甲基化物（p -QMs）与and内酯之间有效的多米诺1，6-加成/分子内环化反应。构建了一系列具有高度非对映选择性（所有> 20：1 dr）的高功能化二氢香豆素，收率良好至优异（高达96％）。在此过程中，布朗斯台德酸不仅在活化两种底物方面起着至关重要的作用，而且在通过氢键相互作用控制反应的非对映选择性方面也起着至关重要的作用。另外，该方案证明了在多米诺反应中利用p -QMs的巨大实用性。