A series of analogues of the dipeptide sweetener L-aspartyl-L-phenylalaninemethylester having hydroxy and/or methoxy substitution on the aromatic ring was synthesized and tasted. The introduction of a methoxy group in the para position of the aromatic ring of the peptide sweetener is crucial to the reduction or destruction of the sweet taste. The effects of substituents in the ortho or meta position
Ligand-Enabled <i>meta</i>-Selective C–H Arylation of Nosyl-Protected Phenethylamines, Benzylamines, and 2-Aryl Anilines
作者:Qiuping Ding、Shengqing Ye、Guolin Cheng、Peng Wang、Marcus E. Farmer、Jin-Quan Yu
DOI:10.1021/jacs.6b11097
日期:2017.1.11
meta-selective C-H arylation of nosyl-protected phenethylamines and benzylamines is disclosed using a combination of norbornene and pyridine-based ligands. Subjecting nosyl protected 2-aryl anilines to this protocol led to meta-C-H arylation at the remote aryl ring. A diverse range of aryl iodides are tolerated in this reaction, along with select heteroaryl iodides. Select aryl bromides bearing ortho-coordinating