Thieme Chemistry Journal Awardees - Where
Are They Now? Palladium-Catalyzed N-Arylation-Hydroamination
Sequence for the Synthesis of Indoles with Sterically
Demanding N-Substituents
Practical and highly versatile, the reaction of readily available (2‐chlorophenyl)acetylene and hydrazine substrates affords substituted 2H‐indazoles in just a few hours under very mildreaction conditions (see scheme; DMF=N,N‐dimethylformamide). The catalyzed domino sequence consists of a regioselective coupling followed by an intramolecular hydroamination and subsequent isomerization of the resulting
Palladium-catalyzed sequential indole synthesis using sterically hindered amines
作者:Lutz Ackermann、René Sandmann、Marvin Schinkel、Mikhail V. Kondrashov
DOI:10.1016/j.tet.2009.07.073
日期:2009.10
A palladium catalyst derived from a bulky N-heterocyclic carbene ligand enabled a modular synthesis of indoles bearing sterically hindered N-alkyl or N-aryl substituents through a reaction sequence comprising an intermolecular N-arylation and an intramolecular hydroamination.
Transition metal catalyzed synthesis of 2H-indazoles
申请人:HALLAND Nis
公开号:US20100234601A1
公开(公告)日:2010-09-16
The present invention relates to a process for the regioselective synthesis of compounds of the formula I,
wherein R0; R1; R2; R3; R4; R5; A1; A2; A3; A4, Q and J have the meanings indicated in the claims. The present invention provides a direct transition metal catalyzed process to a wide variety of multifunctional 2H-indazoles or 2H-azaindazoles of the formula (I) from 2-halo-phenylacetylenes or (2-sulfonato)phenylacetylenes and monosubstituted hydrazines.