N-Hydroxyphthalimide-catalyzed chemoselective benzylic C(sp3)–H amination of unprotected arylalkanols using bis(2,2,2-trichloroethyl)azodicarboxylate has been developed. The use of 1,1,1,3,3,3-hexafluoropropan-2-ol as a solvent plays a critical role in chemoselectivity. The conversion of an aminated product to the corresponding free amino alcohol was also demonstrated.
Origin of and a Solution for Uneven Efficiency by Cinchona Alkaloid-Derived, Pseudoenantiomeric Catalysts for Asymmetric Reactions
作者:Bin Hu、Mark W. Bezpalko、Chao Fei、Diane A. Dickie、Bruce M. Foxman、Li Deng
DOI:10.1021/jacs.8b09010
日期:2018.10.24
other hand, the subtle structural difference between pseudoenantiomeric cinchonaalkaloids could also lead to uneven efficiency that severely limits the applicability of some cinchona alkaloid-catalyzed reactions. We describe here the elucidation of the origin of and the consequent development of novel modifiedcinchonaalkaloids to address such a problem in asymmetric imine umpolung reactions by cinchonium
Synthesis of 1,4-amino alcohols by Grignard reagent addition to THF and N-tosyliminobenzyliodinane
作者:Ciputra Tejo、Yang Feng Anders See、Mitch Mathiew、Philip Wai Hong Chan
DOI:10.1039/c5ob02302e
日期:——
4-amino alcohols from THF treated with N-tosyliminobenzyliodinane (PhINTs) followed by a Grignard reagent under mild reaction conditions at room temperature is described herein. Various Grignard reagents were shown to be compatible, furnishing the corresponding 4-substituted-N-1,4-tosylamino alcohols in good to excellent yields. A partial or full detosylation of the N-tosyl-1,4-amino alcohol was observed
Visible Light‐Induced Unactivated δ‐C(sp
<sup>3</sup>
)−H Amination of Alcohols Catalyzed by Iron
作者:Zhaofan Jue、Yahao Huang、Jiahui Qian、Peng Hu
DOI:10.1002/cssc.202201241
日期:2022.10.21
If the HAT fits: A method to generate δ-C(sp3)−N bonds from primary, secondary, and tertiary alcohols is developed through an iron-catalyzed 1,5-hydrogen atom transfer under mild reaction conditions. This reaction shows a wide substrate scope and a good functional group tolerance.
如果 HAT 适合:在温和的反应条件下,通过铁催化的 1,5-氢原子转移,开发了一种从伯醇、仲醇和叔醇生成 δ-C(sp 3 )-N 键的方法。该反应显示出广泛的底物范围和良好的官能团耐受性。