ambident 3-hydroxyisoxazoles, which are heterocyclic bioisosteres of carboxylic acids, predominates under Mitsunobu conditions. In several cases, excellent O-regioselectivity (⩾95%) was observed. It is noteworthy that reactions were complete within 15 min at room temperature. Furthermore, the conditions are compatible with a range of alcohols that cover all of the typical protecting groups for the 3-hydroxyisoxazole
在环境亲核试剂的官能化中的区域
化学控制在有机
化学中特别令人关注。在本文中,我们证明了在Mitsunobu条件下占优势的3-羟基
异恶唑(是
羧酸的杂环
生物等排体)的O-烷基化占主导地位。在几种情况下,观察到极好的O区域选择性(⩾95%)。值得注意的是,在室温下,反应在15分钟内完成。此外,该条件与覆盖3-羟基
异恶唑基序的所有典型保护基的一系列醇相容,从而为文献中通常采用的醇温和,简单和危险性较小的方案提供了条件。