14380-85-9Relevant articles and documents
Stereoselective synthesis of chiral α-amino-β-lactams through palladium(II)-catalyzed sequential monoarylation/amidation of C(sp 3)-H Bonds
Zhang, Qi,Chen, Kai,Rao, Weihao,Zhang, Yuejun,Chen, Fa-Jie,Shi, Bing-Feng
, p. 13588 - 13592 (2013)
Give Me an Ar, give Me an N! Arylation of the methyl group in a simple derivative of readily available alanine under palladium catalysis was followed by intramolecular amidation at the same position to give chiral α-amino-β-lactams with a wide range of aryl substituents (see scheme; Phth=phthaloyl). The α-amino-β-lactams were obtained in moderate to high yields with good functional-group tolerance and high diastereoselectivity. Copyright
Ligand-Enabled β-C–H Arylation of α-Amino Acids Without Installing Exogenous Directing Groups
Chen, Gang,Zhuang, Zhe,Li, Gen-Cheng,Saint-Denis, Tyler G.,Hsiao, Yi,Joe, Candice L.,Yu, Jin-Quan
supporting information, p. 1506 - 1509 (2017/02/05)
Herein we report acid-directed β-C(sp3)-H arylation of α-amino acids enabled by pyridine-type ligands. This reaction does not require the installation of an exogenous directing group, is scalable, and enables the preparation of Fmoc-protected unnatural amino acids in three steps. The pyridine-type ligands are crucial for the development of this new C(sp3)-H arylation.
A Fluorinated Ligand Enables Room-Temperature and Regioselective Pd-Catalyzed Fluorination of Aryl Triflates and Bromides
Sather, Aaron C.,Lee, Hong Geun,De La Rosa, Valentina Y.,Yang, Yang,Müller, Peter,Buchwald, Stephen L.
supporting information, p. 13433 - 13438 (2015/11/09)
A new biaryl monophosphine ligand (AlPhos, L1) allows for the room-temperature Pd-catalyzed fluorination of a variety of activated (hetero)aryl triflates. Furthermore, aryl triflates and bromides that are prone to give mixtures of regioisomeric aryl fluorides with Pd-catalysis can now be converted to the desired aryl fluorides with high regioselectivity. Analysis of the solid-state structures of several Pd(II) complexes, as well as density functional theory (DFT) calculations, shed light on the origin of the enhanced reactivity observed with L1.