Copper-Catalyzed Enantioselective Aerobic Alkene Aminooxygenation and Dioxygenation: Access to 2-Formyl Saturated Heterocycles and Unnatural Proline Derivatives
作者:Raul L. L. Carmo、Samuel L. Galster、Tomasz Wdowik、Chaeeon Song、Sherry R. Chemler
DOI:10.1021/jacs.3c01985
日期:2023.6.28
Alkene aminooxygenation and dioxygenation reactions that result in carbonyl products are uncommon, and protocols that control absolute stereochemistry are rare. We report herein catalytic enantioselective alkene aminooxygenation and dioxygenation that directly provide enantioenriched 2-formyl saturated heterocycles under aerobic conditions. Cyclization of substituted 4-pentenylsulfonamides, catalyzed
产生羰基产物的烯烃氨基氧化和双氧化反应并不常见,控制绝对立体化学的方案也很少。我们在此报道了催化对映选择性烯烃氨基氧化和双氧化,其在有氧条件下直接提供对映体富集的2-甲酰基饱和杂环。由容易获得的手性铜配合物催化并采用分子氧作为氧源和化学计量氧化剂,取代的4-戊烯基磺酰胺的环化可直接有效地提供手性2-甲酰基吡咯烷。这些醛的还原或氧化后处理提供它们各自的氨基醇或氨基酸(非天然脯氨酸)。还证明了二氢吲哚和异喹啉的对映选择性合成。同时,各种烯醇在类似条件下环化提供2-甲酰基四氢呋喃、酞烷、异色满和吗啉。铜配体的性质、分子氧的浓度和反应温度都会影响产物的分布。手性氮和氧杂环是生物活性小分子的常见成分,这些使能技术提供了用即用型羰基亲电子试剂功能化的饱和杂环。