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.
The acid-mediated ring opening/cyclisation reaction of N-benzyl-α-aryl-azetidinones
作者:Frank D. King、Stephen Caddick
DOI:10.1016/j.tet.2012.09.046
日期:2012.11
N-Benzyl-4-aryl-azetidinones undergo ring opening with triflic acid to form N-benzyl-cinnamamides, which either undergo cyclisation to give 5-aryl-benzazepin-3-ones or N-debenzylation to give cinnamamides. (C) 2012 Elsevier Ltd. All rights reserved.
Harnessing the<i>ortho</i>-Directing Ability of the Azetidine Ring for the Regioselective and Exhaustive Functionalization of Arenes
reagent nBuLi. Two different reaction protocols were discovered for regioselective lithiation at the ortho positions adjacent to the azetidinering, which served as a toolbox when other competing directing groups were installed on the aromatic ring. The coordinating ability of the azetidine nitrogen atom, as well as the involvement of dynamic phenomena related to the preferential conformations of 2‐arylazetidine