在此,我们报道了第一个 Fe II催化的胺类有氧仿生氧化反应。这种氧化反应涉及几个电子转移步骤,受到呼吸链中生物氧化的启发。从胺到分子氧的电子转移由两个耦合催化氧化还原系统辅助,这降低了能垒并提高了氧化反应的选择性。铁氢转移络合物被用作底物选择性脱氢催化剂,同时双功能对苯二酚/钴希夫碱络合物作为混合电子转移介体。各种伯胺和仲胺在空气中被氧化成其相应的醛亚胺或酮亚胺,收率良好至优异。
Iridium-Catalyzed <i>ortho</i>-C(sp<sup>2</sup>)–H Amidation of Benzaldehydes with Organic Azides
作者:Delong Mu、Xinmou Wang、Gong Chen、Gang He
DOI:10.1021/acs.joc.7b00531
日期:2017.4.21
ortho-C(sp2)–H amidation reaction of benzaldehydes with organic azides has been developed. A catalytic amount of 3,5-di(trifluoromethyl)aniline was used to promote the Ir-catalyzed directed C–H amination reaction through a transient aldimine intermediate. This reaction tolerates a broad scope of benzaldehyde substrates and works well with a range of aryl- and alkylsulfonyl azides.
Enantioselective addition of various aryllithiumreagents to aromatic imines was catalyzed (20 mol-%) by readily accessible 1,2-diamines to afford a wide range of protected diarylmethylamines in up to 94 % enantiomeric excess. Furthermore, the absolute configuration of these arylation products was determined by using X-ray crystallography.
各种芳基锂试剂与芳族亚胺的对映选择性加成反应 (20 mol-%) 由易于获得的 1,2-二胺催化,得到多种保护的二芳基甲基胺,对映体过量高达 94%。此外,这些芳基化产物的绝对构型是通过使用 X 射线晶体学确定的。
Cobalt-catalyzed arylation of aldimines via directed C–H bond functionalization: addition of 2-arylpyridines and self-coupling of aromatic aldimines
作者:Ke Gao、Naohiko Yoshikai
DOI:10.1039/c2cc31114c
日期:——
A cobaltâN-heterocyclic carbene catalyst, in combination with an appropriate Grignard reagent, promotes a chelation-assisted aromatic CâH functionalization reaction via addition to an aromatic aldimine.
Montmorillonite K10 catalyzed Mannich-type reaction and hydrophosphonylation proceeded smoothly in water at room temperature to give β-amino esters and α-amino phosphonates, respectively, in good to high yields.
Cobalt-catalyzed ortho-alkenylation of aromatic aldimines via chelation-assisted C–H bond activation
作者:Takeshi Yamakawa、Naohiko Yoshikai
DOI:10.1016/j.tet.2013.02.092
日期:2013.6
An ortho-alkenylation reaction of an aromatic aldimine with an internal alkyne is efficiently promoted by a cobalt catalyst generated from CoBr2, triarylphosphine, and iPrMgBr. The reaction takes place under mild room-temperature conditions to afford, upon acidic hydrolysis, a variety of ortho-alkenylated aromatic aldehydes in moderate to excellent yields. The neighboring formyl and alkenyl groups