NITROGEN-CONTAINING HETEROCYCLIC COMPOUND OR SALT THEREOF
申请人:FUJIFILM Corporation
公开号:US20150322063A1
公开(公告)日:2015-11-12
A compound represented by Formula [1] (in the formula, Z
1
represents N, CH, or the like; X
1
represents NH or the like; R
1
represents a heteroaryl group or the like; each of R
2
, R
3
, and R
4
represents a hydrogen atom, a halogen atom, an alkoxy group, or the like; and R
5
represents a heteroaryl group or the like) or salt thereof.
Selective Palladium‐Catalyzed Direct CH Arylation of Unsubstituted
<i>N</i>
‐Protected Pyrazoles
作者:Esa T. T. Kumpulainen、Antti Pohjakallio
DOI:10.1002/adsc.201301139
日期:2014.5.5
selective C‐5 arylation of N‐dimethylaminosulfamoyl‐protected pyrazole with aryl bromides is catalyzed by 2–5 mol% palladium in the presence of triphenylphosphine ligand and carboxylic acid additive. Selectivities up to 45:1 (C‐5:C‐4) can be achieved by running the reaction in non‐polar solvents. A thorough study of scope and limitations shows good general tolerance of aryl bromide substitution. However
N1-Selective Methylation of Pyrazoles via α-Halomethylsilanes as Masked Methylating Reagents
作者:Emma Yang、Derek M. Dalton
DOI:10.1021/acs.joc.3c02841
日期:2024.3.15
The development of a highlyselective N-methylation of pyrazole heterocycles using commercially available, bench-stable α-halomethylsilanes as masked methylatingreagents is described. Sterically bulky α-halomethylsilanes significantly improve the selectivity of N-alkylation over traditional methylatingreagents and readily undergo protodesilylation in the presence of a fluoride source and water to