Both copper‐ and cobalt‐catalyzed aminations of arylzincs using N‐benzoyloxy amines are possible. Thus, thienylzincs prepared by transmetalation from thienylmagnesium halides obtained by various methods including deprotometalation were aminated with success. In addition, triarylamines were prepared from aminothiophenes by consecutive copper‐catalyzed N‐arylations using iodoarenes.
Metal-Free Synthesis of 2-Aminobenzothiazoles via Iodine-Catalyzed and Oxygen-Promoted Cascade Reactions of Isothiocyanatobenzenes with Amines
作者:Yuanshuang Xu、Bin Li、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.7b01683
日期:2017.9.15
the cascade reactions of isothiocyanatobenzenes with primary or secondaryamines by using iodine as a catalyst and oxygen as an oxidant is presented. Mechanistically, the formation of the title compounds involves the in situ formation of the required benzothiourea intermediate followed by its intramolecular cross dehydrogenativecoupling of a C(sp2)–H bond and a S–H bond. To our knowledge, this should
Electrochemical intramolecular dehydrogenative C–S bond formation for the synthesis of benzothiazoles
作者:Pan Wang、Shan Tang、Aiwen Lei
DOI:10.1039/c7gc00468k
日期:——
An external oxidant-free intramolecular dehydrogenative C-S cross-coupling has been developed under undivided electrolytic conditions. Various 2-aminobenzothiazoles could be synthesized with up to 99% yield from the direct combination of aryl...
Dioxygen-triggered oxidative cleavage of the C–S bond towards C–N bond formation
作者:Zongchao Lv、Huamin Wang、Zhicong Quan、Yuan Gao、Aiwen Lei
DOI:10.1039/c9cc05707b
日期:——
Research on the cleavage of C–C bonds has been well developed. By comparison with this, the activation of C–S bonds remains challenging. Herein, dioxygen-triggered oxidative cleavage of C–S bonds has been achieved, delivering a series of N-containing heterocyclic compounds that are frequently found in pesticides and pharmaceuticals. Additionally, the potential utility of this protocol was further demonstrated
Copper- and palladium-catalyzed intramolecular C–S bond formation: a convenient synthesis of 2-aminobenzothiazoles
作者:Laurie L. Joyce、Ghotas Evindar、Robert A. Batey
DOI:10.1039/b311591g
日期:——
Copper- and palladium-catalyzed intramolecular CâS bond formation by cross-coupling between an aryl halide and thiourea functionality is demonstrated for the synthesis of 2-aminobenzothiazoles, wherein the Cu-catalyzed protocol is generally superior and more cost effective than the Pd-catalyzed protocol; the Cu-catalyzed reaction also further expands recent studies exploring the utility of Cu salts as replacements for Pd in carbonâheteroatom bond-forming reactions. A one-pot variant combining the synthesis of the thiourea and the cyclization was also demonstrated.