Highly Regioselective Aromatic C–H Allylation of <i>N</i>-(Arylmethyl)sulfonimides with Allyl Grignard Reagents Involving Benzylic C–N Cleavage
作者:Meng-Zeng Zhu、Dong Xie、Shi-Kai Tian
DOI:10.1021/acs.orglett.1c02437
日期:2021.9.3
C–H functionalization of benzyl electrophiles with nucleophiles via palladium-catalyzed benzylic C–N cleavage. A range of N-(1-naphthylmethyl)sulfonimides, N-(2-thienylmethyl)sulfonimides, and N-(2-furanylmethyl)sulfonimides smoothly underwent palladium-catalyzed aromatic C–H allylation with allyl Grignard reagents at roomtemperature, delivering structurally diverse substituted 1-allylnaphthalenes and
Pd-catalyzed allylative dearomatisation using Grignard reagents
作者:Cosimo Boldrini、Syuzanna R. Harutyunyan
DOI:10.1039/d1cc05609c
日期:——
naphthyl halides is shown to be feasible by employing Grignard reagents. The high reactivity of the nucleophile allows for fast reactions and low catalyst loading, while a plethora of successfully substituted compounds illustrate the broad scope. Five membered heteroaromatic compounds are also demonstrated to be reactive under similar conditions.
A catalytic dearomative three-componentreaction of bromoarenes with TMS-diazomethane and allyl borate was developed. The key of this assembling reaction is the use of a diazocompound to generate a Pd-π-benzyl intermediate through a Pd-carbene species. This method allowed for a dearomative functionalization, using arenes as limiting reagents. Heteroaryl bromides were also applicable to give dearomatized
Palladium-Catalyzed Regioselective Allylation of Chloromethyl(hetero)arenes with Allyl Pinacolborate
作者:Sheng Zhang、Aziz Ullah、Yoshinori Yamamoto、Ming Bao
DOI:10.1002/adsc.201700350
日期:2017.8.17
The palladium-catalyzed regioselective allylation reaction between chloromethyl(hetero)arenes and allyl pinacolborate is reported in this work. Chloromethylarenes smoothly reacted with allyl pinacolborate, producing para-allylated dearomatization products or para-allylated arenes in satisfactory to good yields. 2-(Chloromethyl)thiophenes and 2-(chloromethyl)furans bearing substituents on the 5-positions
Palladium-Catalyzed sp<sup>2</sup>–sp<sup>3</sup> Coupling of Chloromethylarenes with Allyltrimethoxysilane: Synthesis of Allyl Arenes
作者:Sheng Zhang、Jinfang Cai、Yoshinori Yamamoto、Ming Bao
DOI:10.1021/acs.joc.7b00678
日期:2017.6.2
Palladium-catalyzed remote sp2–sp3 coupling reaction of chloromethylarenes with allyltrimethoxysilane is described in this work. The allylation reaction regioselectively occurred on the para-positions of 1-(chloromethyl)naphthalenes and benzyl chlorides to form new C(sp2)–C(sp3) bonds. The reaction proceeds smoothly under mild conditions to produce allyl arenes in moderate to excellent yields.