Palladium‐Catalyzed
N3
‐Directed C−H Halogenation of
N9
‐Arylpurines and Azapurines
摘要:
AbstractA palladium‐catalyzed direct ortho‐halogenation of N9‐arylpurines was developed by using N‐halogenated succinimide (NBS/NCS/NIS) as the halogenation reagents. The current procedure offers a late‐stage strategy to generate N9‐(ortho‐haloaryl)purines in moderate to excellent yields. The protocol was applicable to the substrates with both electron‐rich and electron‐deficient substituents and only monohalogenated products were formed. Moreover, the purinyl N3‐atom was verified as the directing group to facilitate Pd‐catalyzed ortho‐C−H activation.
Purinyl N<sup>3</sup>-Directed Palladium-Catalyzed C–H Alkoxylation of <i>N</i><sup>9</sup>-Arylpurines: A Late-Stage Strategy to Synthesize <i>N</i><sup>9</sup>-(<i>ortho</i>-Alkoxyl)arylpurines
作者:Mingwu Yu、Zhiqian Wang、Miao Tian、Chenghu Lu、Shunlai Li、Hongguang Du
DOI:10.1021/acs.joc.6b00148
日期:2016.4.15
A palladium-catalyzed alkoxylation of N-9-arylpurines with primary or secondary alcohols has been developed successfully, which is a rare C-H activation reaction of polynitrogenated purines and offers a late-stage strategy to synthesize N-9-(ortho-alkoxyl)-arylpurines. Although there are more than four nitrogen atoms present in the purine moiety, the reaction can be effectively conducted by sterically blocking the N-1 site for catalyst coordination and first employing the purinyl N-3 atom as a directing group.
Higashino, Takeo; Katori, Tatsuhiko; Yoshida, Shizuo, Chemical and pharmaceutical bulletin, 1980, vol. 28, # 1, p. 255 - 261
HIGASHINO T.; KATORI T.; KAWARAYA H.; HAYASHI E., CHEM. AND PHARM. BULL., 1980, 28, NO 1, 337-343
作者:HIGASHINO T.、 KATORI T.、 KAWARAYA H.、 HAYASHI E.
DOI:——
日期:——
HIGASHINO TAKEO; KATORI TATSUHIKO; YOSHIDA SHIZUO; HAYASHI EISAKU, CHEM. AND PHARM. BULL., 1980, 28, NO 1, 255-261
作者:HIGASHINO TAKEO、 KATORI TATSUHIKO、 YOSHIDA SHIZUO、 HAYASHI EISAKU
DOI:——
日期:——
RESIN COMPOSITION AND ELECTRONIC DEVICE
申请人:Konica Minolta, Inc.
公开号:US20210347964A1
公开(公告)日:2021-11-11
A resin composition includes a resin or a resin precursor, and a nitrogen-containing aromatic heterocyclic compound. The nitrogen-containing aromatic heterocyclic compound has a structure represented by the following general formula (1), the following general formula (6) or the following general formula (7). The resin composition includes the nitrogen-containing aromatic heterocyclic compound in a range from 0.10 to 30% by mass relative to the resin or the resin precursor.
In the general formula (1), A1 and A2 each represent a 6-membered nitrogen-containing aromatic heterocyclic ring together with a nitrogen atom, and the 6-membered nitrogen-containing aromatic heterocyclic ring optionally forms a fused ring; and L represents a single bond, or a linking group derived from an aromatic hydrocarbon ring, an aromatic heterocyclic ring, or an alkyl group.