Asymmetric Radical Process for General Synthesis of Chiral Heteroaryl Cyclopropanes
作者:Xiaoxu Wang、Jing Ke、Yiling Zhu、Arghya Deb、Yijie Xu、X. Peter Zhang
DOI:10.1021/jacs.1c04655
日期:2021.7.28
applicable to α-pyridyl and other α-heteroaryldiazomethanes for asymmetric cyclopropanation of wide-ranging alkenes, including several types of challenging substrates. This new catalytic methodology provides a general access to valuable chiral heteroaryl cyclopropanes in high yields with excellent both diastereoselectivities and enantioselectivities. Combined computational and experimental studies further
通过Co(II)基金属自由基催化(MRC),开发了一种高效催化方法,用于烯烃与原位生成的α-杂芳基重氮甲烷的不对称自由基环丙烷化。通过对新合成的D 2 -对称手性酰胺卟啉作为支持配体的类空腔环境进行微调,优化的Co(II)基金属自由基体系广泛适用于α-吡啶基和其他α-杂芳基重氮甲烷,用于不对称环丙烷化范围广泛的烯烃,包括几种类型的具有挑战性的底物。这种新的催化方法提供了以高产率获得有价值的手性杂芳基环丙烷的通用途径,并具有优异的非对映选择性和对映选择性。计算和实验相结合的研究进一步支持了以α-和γ-金属烷基自由基作为关键中间体的Co(II)基烯烃环丙烷化的基本逐步自由基机理。