Asymmetric Synthesis of N‐Fused 1,3‐Oxazolidines via Pd‐Catalyzed Decarboxylative (3+2) Cycloaddition,Advanced Synthesis & Catalysis

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Asymmetric Synthesis of N‐Fused 1,3‐Oxazolidines via Pd‐Catalyzed Decarboxylative (3+2) Cycloaddition
Advanced Synthesis & Catalysis ( IF 4.4 ) Pub Date : 2020-03-23 , DOI: 10.1002/adsc.201901497
Jong‐Un Park ₁ , Hye‐In Ahn ₁ , Ho‐Jun Cho ₁ , Zi Xuan ₁ , Ju Hyun Kim ₁

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Efficient synthesis of optically active N‐fused 1,3‐oxazolidines containing quaternary and tertiary stereocenters was achieved via Pd‐catalyzed asymmetric (3+2) cycloadditions of sulfamate‐derived cyclic imines and vinylethylene carbonates. Using a chiral phosphoramidite ligand, the cycloadditions proceeded effectively providing sulfamidate‐fused 1,3‐oxazolidines in high yields (up to 96%) with stereoselectivities (up to 25:1 dr; >99% ee). Additionally, the scale‐up reaction and further transformations of the product were also achieved demonstrating the synthetic utility toward the construction of useful heterocycles such as chiral oxazoline bearing a quaternary stereocenter.

中文翻译：

通过Pd催化的脱羧（3 + 2）环加成反应不对称合成N-融合的1,3-恶唑烷

高效的合成方法是通过Pd催化氨基磺酸衍生的环状亚胺和碳酸乙烯基亚乙酯的Pd催化不对称（3 + 2）环加成反应，合成具有季和叔立体中心的旋光N-融合的1,3-恶唑烷。使用手性亚磷酰胺配体，可以有效地进行环加成反应，从而以高产率（高达96％）提供氨基磺酸酯融合的1,3-恶唑烷，并具有立体选择性（高达25：1 dr;> 99％ee）。此外，还实现了规模放大反应和产品的进一步转化，证明了其在构建有用的杂环（如带有四级立体中心的手性恶唑啉）方面的合成效用。

更新日期：2020-03-23

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