Phosphine-Free Palladium-Catalyzed C−H Bond Arylation of Free (N−H)-Indoles and Pyrroles
摘要:
This paper describes a phosphine-free palladium-catalyzed method for direct C-arylation of free (N-H)-indoles and pyrroles with iodo- and bromoarene donors. Employing commercially available materials, this new and operationally simple procedure provides a rapid entry to a wide range of C-arylated (N-H)-indoles including derivatives of tryptamine. In the course of this study, a profound halide effect was uncovered, affecting both the efficiency and regioselectivity of indole arylation.
This invention relates to certain novel imidazoline compounds and analogues thereof, to their use for the treatment of diabetes, diabetic complications, metabolic disorders, or related diseases where impaired glucose disposal is present, to pharmaceutical compositions comprising them, and to processes for their preparation.The compounds have the following formula: whereinX is -O-, -S-, or -NR5-;R5 is hydrogen, C1-8 alkyl, or an amino protecting group;R4 isY is -O-, -S-, or -NR8-;Y' is -O- or -S-;
Transition-Metal-Controlled Synthesis of 11<i>H</i>-Benzo[<i>a</i>]carbazoles and 6-Alkylidene-6<i>H</i>-isoindo[2,1-<i>a</i>]indoles via Sequential Intermolecular/Intramolecular Cross-Dehydrogenative Coupling from 2-Phenylindoles
A catalyst-controlled synthesis of 11H-benzo[a]carbazoles and 6-alkylidene-6H-isoindo[2,1-a]indoles is described. Pd(OAc)2 favored 6-alkylidene-6H-isoindo[2,1-a]indolesvia intramolecular C-H/N-H CDC reaction, while [Cp*RhCl2]2 led to 11H-benzo[a]carbazoles through intramolecular C-H/C-H CDC reaction. Moreover, the synthesis of 11H-benzo[a]carbazolesvia sequential intermolecular ortho C-H/olefin coupling
Chemodivergent Synthesis of Indeno[1,2-<i>b</i>]indoles and Isoindolo[2,1-<i>a</i>]indoles via Mn(III)-Mediated or Electrochemical Intramolecular Radical Cross-Dehydrogenative Coupling
Chemodivergent synthesis of indeno[1,2-b]indoles and isoindolo[2,1-a]indoles from the same starting materials involving radical cross-dehydrogenativecouplings have been developed. Mn(OAc)3·2H2O selectively promoted an intramolecular radical C–H/C–H dehydrogenative coupling reaction to provide indeno[1,2-b]indoles, while an intramolecular radical C–H/N–H dehydrogenative coupling reaction could proceed
已经开发了由涉及自由基交叉脱氢偶联的相同起始材料的茚并[1,2- b ]吲哚和异吲哚[ 2,1- a ]吲哚的化学发散合成。Mn(OAc) 3 ·2H 2 O选择性促进分子内自由基C-H/C-H脱氢偶联反应生成茚并[1,2- b ]吲哚,而分子内自由基C-H/N-H脱氢偶联反应可以通过电化学传递异吲哚[2,1- a ]吲哚。提出了化学发散反应的合理机制。
Rhodium-catalyzed direct C H amination of 2-arylindoles and 7-arylindoles with free amines