The acid-mediated ring opening reactions of α-aryl-lactams
作者:Frank D. King、Stephen Caddick
DOI:10.1039/c2ob00012a
日期:——
4-Aryl-azetidin-2-ones (β-lactams) undergo ring opening with triflic acid to give cinnamamides which, in benzene, react further to give 3-aryl-3-phenyl-propionamides. Prolonged reaction times in benzene give 3,3-diphenyl-propionamide via an aryl/phenyl exchange. Lactams of ring size 7 and higher also ring open, but only 7- and 8-membered rings give pure diphenylalkylamides. AlCl3 only ring opens the 4-aryl-azetidinones.
An efficient and environmentally benign synthesis of phenanthridine by electrochemically oxidative cyclocoupling of biaryl vinyl azide with sodium azide and benzenesulfonyl hydrazide, respectively, is reported. The reaction is carried out in undivided cell at room temperature, without additional metal‐catalysis or exogenous oxidant.
Electron-Catalyzed Fluoroalkylation of Vinyl Azides
作者:Emily G. Mackay、Armido Studer
DOI:10.1002/chem.201602855
日期:2016.9.12
The transition‐metal free fluoroalkylation of vinylazides is herein reported. This operationally simple reaction employs the Togni reagent as a CF3 source, Bu4NI as an initiator, and occurs under electron catalysis. A range of readily prepared starting materials are functionalized using this approach to produce both phenanthridines and quinoxalin‐2‐ones.