Copper‐Catalyzed Enantioselective Synthesis of Oxazolines from Aminotriols via Asymmetric Desymmetrization
作者:Kosuke Yamamoto、Yutaro Tsuda、Masami Kuriyama、Yosuke Demizu、Osamu Onomura
DOI:10.1002/asia.201901742
日期:2020.3.16
transformation of tris(hydroxymethyl)aminomethane-derived aminotriols was developed to provide multisubstituted oxazolines with a tetrasubstituted carbon center. The present transformation consisted of sequential reactions involving mono-sulfonylation of aminotriols, subsequent intramolecular cyclization to afford prochiral oxazoline diols, and sulfonylative asymmetric desymmetrization of resultant oxazoline diols
开发了铜催化的三(羟甲基)氨基甲烷衍生的氨基三醇的对映选择性转化,以提供具有四取代的碳中心的多取代的恶唑啉。本转化包括顺序反应,该顺序反应涉及氨基三醇的单磺酰化,随后的分子内环化以提供手性恶唑啉二醇,以及所得恶唑啉二醇的磺化不对称脱对称。另外,动力学拆分过程将涉及磺化不对称去对称化步骤,这将放大所需产物的对映体纯度。在本反应中可以耐受各种氨基三醇,以良好的产率至高产率提供具有优异对映选择性的所需恶唑啉。