Palladium-catalyzed oxidative C–H bond acylation of N-nitrosoanilines with toluene derivatives: a traceless approach to synthesize N-alkyl-2-aminobenzophenones
作者:Yinuo Wu、Ling-Jun Feng、Xiao Lu、Fuk Yee Kwong、Hai-Bin Luo
DOI:10.1039/c4cc07440h
日期:——
A palladium-catalyzed cascade cross-coupling of N-nitroso-anilines and toluene derivatives for the direct synthesis of N-alkyl-2-aminobenzophenones is described. N-nitroso groups in anilines can act as the traceless directing groups while toluene derivatives can serve as effective acyl precursors under mild reaction conditions.
Copper-Catalyzed Intramolecular Oxidative CH Functionalization and CN Formation of 2-Aminobenzophenones: Unusual Pseudo-1,2-Shift of the Substituent on the Aryl Ring
A good move: A copper‐catalyzed intramolecular oxidative CH functionalization of 2‐aminobenzophenone affords two regioisomeric acridones (see scheme). The reaction involves an unusual pseudo‐1,2‐migration of R2 group(s) on the arene ring (bpy=2,2′‐bipyridine, DMAc=dimethylacetimide).
Silica Gel-Mediated Hydroamination/Semipinacol Rearrangement of 2-Alkylaminophenylprop-1-yn-3-ols: Synthesis of 2-Oxindoles from Alkynes and 1-(2-Aminophenyl) Ketones
作者:Dewi Susanti、Linda Li Ru Ng、Philip Wai Hong Chan
DOI:10.1002/adsc.201300911
日期:2014.2.10
Abstract2‐Alkylaminophenylprop‐1‐yn‐3‐ols, prepared from the lithium diisopropylamide (LDA)‐mediated 1,2‐addition of alkynes to 1‐(2‐aminophenyl) ketones, can be converted to 3,3‐disubstituted 2‐oxindoles by using silica gel in n‐hexane/ethyl acetate (20:1 v/v) as the reaction medium. The utility of the approach as a potential scale‐up strategy for the synthesis of 2‐oxindoles was exemplified by the large‐scale synthesis of one adduct in excellent yield. The synthetic applicability of this chemistry was also demonstrated by the recycling of the silica gel up to 8 times with no apparent loss of activity being observed for the same example.magnified image