[Cp*Rh<sup>III</sup>
] in an Ionic Liquid as a Highly Efficient and Recyclable Catalytic Medium for Regio- and Diastereoselective Csp<sup>3</sup>
-H Carbenoid Insertion
A bidentate‐assisted Csp3–H bond insertion using Cp*RhIII/IL as a highlyefficient and recyclable catalytic medium is reported. The application of ionicliquid not only lowered the temperature, but also enhanced the diastereoselectivity of this reaction. This work significantly expanded the scope of ionicliquids in Csp3–H functionalizations
据报道,使用Cp * Rh III / IL作为高效且可回收的催化介质,可进行双齿辅助的Csp 3 -H键插入。离子液体的应用不仅降低了温度,而且提高了该反应的非对映选择性。这项工作大大扩展了Csp 3 -H官能化中离子液体的范围
Pd(<scp>ii</scp>)-Catalyzed gamma-C(sp<sup>3</sup>)–H alkynylation of amides: selective functionalization of R chains of amides R<sup>1</sup>C(O)NHR
作者:Vinod G. Landge、Ayisha Parveen、Avanashiappan Nandakumar、Ekambaram Balaraman
DOI:10.1039/c8cc03445a
日期:——
of R chains of amides R1C(O)NHR, a fundamental class of synthetic substrates, has not been accomplished to date. Here, the first example of palladium(II)-catalyzed alkynylation of an unactivated gamma C(sp3)–H bond of alkyl amides (cyclic, linear, and amino acids) is reported. The kinetic experiment shows that the rate of the reaction depends on the coupling partners and the amides. Late-stage diversification
PALLADIUM (II)-CATALYZED gammaC(SP3)-H ALKYNYLATION OF AMINE2
申请人:Council of Scientific & Industrial Research
公开号:US20200317615A1
公开(公告)日:2020-10-08
The present invention relates to a Palladium (II)-catalyzed C(sp
3
)—H alkynylation of amines using picolinamide as directing group. The developed alkynylation strategy is simple, efficient, and tolerant of various ring size including five to eight member cyclic, quaternary amines, and N-heterocyclic motifs.
Rhodium acylnitrene complexes are widely implicated in catalytic C–H amidation reactions but have eluded isolation and structuralcharacterization. To overcome this challenge, we designed a chromophoric octahedral rhodium complex with a bidentate dioxazolone ligand, in which photoinduced metal-to-ligand charge transfer initiates catalytic C–H amidation. X-ray photocrystallographic analysis of the Rh-dioxazolone
铑酰基氮烯配合物广泛参与催化 C-H 酰胺化反应,但一直未能进行分离和结构表征。为了克服这一挑战,我们设计了一种带有二齿二恶唑酮配体的发色八面体铑配合物,其中光诱导的金属到配体的电荷转移引发催化C-H酰胺化。Rh-二恶唑酮复合物的 X 射线光晶体分析可以阐明目标 Rh-酰基氮烯类化合物的结构,并提供确凿的证据证明单线态氮烯类化合物主要负责酰基氨基转移反应。我们还监测到在水晶中亲核试剂与原位生成的 Rh-酰基氮烯类化合物的反应,提供了晶体学可追踪的反应系统来捕获氮烯类化合物转移的机械快照。