Regioselective C–H bond functionalizations of acridines using organozinc reagents
作者:Isao Hyodo、Mamoru Tobisu、Naoto Chatani
DOI:10.1039/c1cc16582h
日期:——
Despite the recent advance in CâH bond functionalization chemistry, the CâH bonds in the acridine ring system, which is an important scaffold in medicinal and material science, have met with limited success, due, in part, to the lack of activated CâH bonds adjacent to the ring nitrogen atom. Herein, several protocols that can effect the regioselective arylation and alkylation of acridines at the C-4 and C-9 positions are described.
New reductive rearrangement of <i>N</i>-arylindoles triggered by the Grubbs–Stoltz reagent Et<sub>3</sub>SiH/KO<sup>t</sup>Bu
作者:Andrew J. Smith、Daniela Dimitrova、Jude N. Arokianathar、Krystian Kolodziejczak、Allan Young、Mark Allison、Darren L. Poole、Stuart G. Leach、John A. Parkinson、Tell Tuttle、John A. Murphy
DOI:10.1039/d0sc00361a
日期:——
N-Arylindoles are transformed into dihydroacridines in a new type of rearrangement, through heating with triethylsilane and potassium tert-butoxide. Studies indicate that the pathway involves (i) the formation of indole radical anions followed by fragmentation of the indole C2–N bond, and (ii) a ring-closing reaction that follows a potassium-ion dependent hydrogen atom transfer step. Unexpected behaviors