Enantioselective Iridium-Catalyzed Allylation of Nitroalkanes: Entry to β-Stereogenic α-Quaternary Primary Amines
作者:Woo-Ok Jung、Binh Khanh Mai、Brian J. Spinello、Zachary J. Dubey、Seung Wook Kim、Craig E. Stivala、Jason R. Zbieg、Peng Liu、Michael J. Krische
DOI:10.1021/jacs.1c05212
日期:2021.6.30
The first systematic study of simple nitronate nucleophiles in iridium-catalyzed allylic alkylation is described. Using a tol-BINAP-modified π-allyliridium C,O-benzoate catalyst, α,α-disubstituted nitronates substitute racemic branched alkyl-substituted allylic acetates, thus providing entry to β-stereogenic α-quaternary primary amines. DFT calculations reveal early transition states that render the
描述了铱催化烯丙基烷基化中简单硝基亲核试剂的首次系统研究。使用tol-BINAP修饰的π-烯丙基铱C , O-苯甲酸酯催化剂,α,α-二取代硝基化合物取代外消旋支链烷基取代的烯丙基乙酸酯,从而提供β-立体异构α-季伯胺的入口。 DFT 计算揭示了早期过渡态,使反应对空间效应和非对映手性铱 π-烯丙基络合物的明显反式效应不太敏感,从而促进了拥挤的三级-四级 C-C 键的形成。