A Pd-catalyzed, boron ester-mediated, reductive cross-coupling of two aryl halides to synthesize tricyclic biaryls
作者:Zhilong Chen、Xiaodong Wang
DOI:10.1039/c7ob01237c
日期:——
Tricyclic biaryls are important scaffold structures in many natural products and lead compounds in drug discovery. The formation of a biaryl unit is often the key step for the synthesis of tricyclic biaryls. Despite significant progress toward the synthesis of biaryl compounds in recent years, the direct cross-coupling of two different aryl halides is still challenging and robust methods are lacking
Heck reaction of N-(2-halophenyl)-N-methyl-1-cyclohexene-1-carboxamide (1) and 2-bromo-N-methyl-N-phenyl-1-cyclohexene-1-carboxamide (4) using a palladium reagent under several reaction conditions was examined. Reaction of 4 using Pd(OAc) 2 , DPPP, and Bu 3 P afforded tetrahydrophenanthridone (5) in excellent yield.
N-(2-卤代苯基)-N-甲基-1-环己烯-1-甲酰胺(1)和2-溴-N-甲基-N-苯基-1-环己烯-1-甲酰胺(4)的Heck反应使用检查了几种反应条件下的钯试剂。4 使用 Pd(OAc) 2 、DPPP 和 Bu 3 P 反应以优异的收率得到四氢菲啶酮 (5)。
Silver-catalysed double decarboxylative addition–cyclisation–elimination cascade sequence for the synthesis of quinolin-2-ones
作者:C. Munashe Mazodze、Wade F. Petersen
DOI:10.1039/d2ob00521b
日期:——
An atom-efficient silver-catalysed double carboxylative strategy for the one-step synthesis of quinolin-2-ones via an addition–cyclisation–elimination cascade sequence of oxamic acids to acrylic acids, mediated either thermally or photochemically, is reported. The reaction was applicable to the synthesis of a broad range of quinolin-2-ones and featured a double-disconnection approach that constructed
N-heterocyclic carbene (NHC)-catalyzed intramolecular cyclization of acrylamides that contain a 2-fluorophenyl group on the nitrogen through a CSN Ar reaction. By using this catalytic method, it is possible to synthesize an array of quinolin-2-one derivatives, which are common structural motifs in pharmaceuticals and organic materials. DFT calculations unambiguously revealed that this reaction proceeds through