Synthesis of a Chiral <i>C</i><sub>2</sub>-Symmetric Sterically Hindered Pyrrolidine Nitroxide Radical via Combined Iterative Nucleophilic Additions and Intramolecular 1,3-Dipolar Cycloadditions to Cyclic Nitrones
作者:Denis A. Morozov、Igor A. Kirilyuk、Denis A. Komarov、Andrea Goti、Irina Yu. Bagryanskaya、Natalia V. Kuratieva、Igor A. Grigor’ev
DOI:10.1021/jo3019158
日期:2012.12.7
successfully synthesized starting from an l-tartaric derived nitrone. Starting from a pyrrolidine flanked by two methylene groups, complete quaternization of the two α-carbon atoms has been accomplished through iteration of completely regio- and stereoselective intramolecular cycloaddition reactions and organometallic additions to key nitrone intermediates, formed in turn by oxidation procedures. This
位阻双螺环C 2对称手性吡咯烷型一氧化氮已成功地从1开始合成。-酒石酸衍生的硝酮。从两侧带有两个亚甲基的吡咯烷开始,两个α-碳原子的完全季铵化反应是通过重复进行完全区域和立体选择性分子内环加成反应以及将有机金属加成至关键的硝酮中间体而实现的,该过程依次由氧化过程形成。该方法似乎对于在氮氧化物基团附近建立大的螺环部分非常有用,并且为传统的氮氧化物合成方法提供了重要的补充。将合成的手性氨基氧表现出非常高的稳定性,以减少与抗坏血酸(ķ ≈8×10 -3中号-1小号-1)。