Oxetan-3-ols as 1,2-bis-Electrophiles in a Brønsted-Acid-Catalyzed Synthesis of 1,4-Dioxanes
作者:Juan J. Rojas、Elena Torrisi、Maryne A. J. Dubois、Riashat Hossain、Andrew J. P. White、Giovanni Zappia、James J. Mousseau、Chulho Choi、James A. Bull
DOI:10.1021/acs.orglett.2c00568
日期:2022.4.1
that combine diacceptors with bis-nucleophiles are uncommon. Here, we report the synthesis of 1,4-dioxanes from 3-aryloxetan-3-ols, as 1,2-bis-electrophiles and 1,2-diols. Brønsted acid Tf2NH catalyzes both the selective activation of the oxetanol, to form an oxetane carbocation that reacts with the diol, and intramolecular ring opening of the oxetane. High regio- and diastereoselectivity are achieved
将双受体与双亲核试剂结合的环化并不常见。在这里,我们报告了从 3-aryloxetan-3-ols 合成 1,4-二恶烷,作为 1,2-bis-亲电子试剂和 1,2-diols。布朗斯台德酸 Tf 2 NH 催化氧杂环丁烷的选择性活化,形成与二醇反应的氧杂环丁烷碳正离子,以及氧杂环丁烷的分子内开环。不对称二醇实现了高区域和非对映选择性。取代的二恶烷和稠合双环产物为药物发现提供了有趣的基序,并且可以进一步功能化。